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/*
   Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/
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/*****************************************************************************
**
** This file implements classes defined in sql_class.h
** Especially the classes to handle a result from a select
**
*****************************************************************************/

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#ifdef USE_PRAGMA_IMPLEMENTATION
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#pragma implementation				// gcc: Class implementation
#endif

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#include "my_global.h"                          /* NO_EMBEDDED_ACCESS_CHECKS */
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#include "sql_priv.h"
#include "unireg.h"                    // REQUIRED: for other includes
#include "sql_class.h"
#include "sql_cache.h"                          // query_cache_abort
#include "sql_base.h"                           // close_thread_tables
#include "sql_time.h"                         // date_time_format_copy
#include "sql_acl.h"                          // NO_ACCESS,
                                              // acl_getroot_no_password
#include "sql_base.h"                         // close_temporary_tables
#include "sql_handler.h"                      // mysql_ha_cleanup
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#include "rpl_rli.h"
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#include "rpl_filter.h"
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#include "rpl_record.h"
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#include "slave.h"
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#include <my_bitmap.h>
#include "log_event.h"
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#include "sql_audit.h"
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#include <m_ctype.h>
#include <sys/stat.h>
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#include <thr_alarm.h>
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#ifdef	__WIN__
#include <io.h>
#endif
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#include <mysys_err.h>
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#include <limits.h>
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#include "sp_rcontext.h"
#include "sp_cache.h"
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#include "transaction.h"
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#include "debug_sync.h"
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#include "sql_parse.h"                          // is_update_query
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#include "sql_callback.h"
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/*
  The following is used to initialise Table_ident with a internal
  table name
*/
char internal_table_name[2]= "*";
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char empty_c_string[1]= {0};    /* used for not defined db */
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const char * const THD::DEFAULT_WHERE= "field list";

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/*****************************************************************************
** Instansiate templates
*****************************************************************************/

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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
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template class List<Key_part_spec>;
template class List_iterator<Key_part_spec>;
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template class List<Alter_drop>;
template class List_iterator<Alter_drop>;
template class List<Alter_column>;
template class List_iterator<Alter_column>;
#endif

/****************************************************************************
** User variables
****************************************************************************/

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extern "C" uchar *get_var_key(user_var_entry *entry, size_t *length,
                              my_bool not_used __attribute__((unused)))
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{
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  *length= entry->name.length;
  return (uchar*) entry->name.str;
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}

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extern "C" void free_user_var(user_var_entry *entry)
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{
  char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry));
  if (entry->value && entry->value != pos)
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    my_free(entry->value);
  my_free(entry);
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}

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bool Key_part_spec::operator==(const Key_part_spec& other) const
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{
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  return length == other.length &&
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         !my_strcasecmp(system_charset_info, field_name.str,
                        other.field_name.str);
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}

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/**
  Construct an (almost) deep copy of this key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

Key::Key(const Key &rhs, MEM_ROOT *mem_root)
  :type(rhs.type),
  key_create_info(rhs.key_create_info),
  columns(rhs.columns, mem_root),
  name(rhs.name),
  generated(rhs.generated)
{
  list_copy_and_replace_each_value(columns, mem_root);
}

/**
  Construct an (almost) deep copy of this foreign key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

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Foreign_key::Foreign_key(const Foreign_key &rhs, MEM_ROOT *mem_root)
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  :Key(rhs),
  ref_table(rhs.ref_table),
  ref_columns(rhs.ref_columns),
  delete_opt(rhs.delete_opt),
  update_opt(rhs.update_opt),
  match_opt(rhs.match_opt)
{
  list_copy_and_replace_each_value(ref_columns, mem_root);
}
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/*
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  Test if a foreign key (= generated key) is a prefix of the given key
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  (ignoring key name, key type and order of columns)

  NOTES:
    This is only used to test if an index for a FOREIGN KEY exists

  IMPLEMENTATION
    We only compare field names

  RETURN
    0	Generated key is a prefix of other key
    1	Not equal
*/

bool foreign_key_prefix(Key *a, Key *b)
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{
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  /* Ensure that 'a' is the generated key */
  if (a->generated)
  {
    if (b->generated && a->columns.elements > b->columns.elements)
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      swap_variables(Key*, a, b);               // Put shorter key in 'a'
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  }
  else
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  {
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    if (!b->generated)
      return TRUE;                              // No foreign key
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    swap_variables(Key*, a, b);                 // Put generated key in 'a'
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  }

  /* Test if 'a' is a prefix of 'b' */
  if (a->columns.elements > b->columns.elements)
    return TRUE;                                // Can't be prefix

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  List_iterator<Key_part_spec> col_it1(a->columns);
  List_iterator<Key_part_spec> col_it2(b->columns);
  const Key_part_spec *col1, *col2;
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#ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS
  while ((col1= col_it1++))
  {
    bool found= 0;
    col_it2.rewind();
    while ((col2= col_it2++))
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    {
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      if (*col1 == *col2)
      {
        found= TRUE;
	break;
      }
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    }
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    if (!found)
      return TRUE;                              // Error
  }
  return FALSE;                                 // Is prefix
#else
  while ((col1= col_it1++))
  {
    col2= col_it2++;
    if (!(*col1 == *col2))
      return TRUE;
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  }
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  return FALSE;                                 // Is prefix
#endif
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}


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/****************************************************************************
** Thread specific functions
****************************************************************************/
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/**
  Get reference to scheduler data object

  @param thd            THD object

  @retval               Scheduler data object on THD
*/
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void *thd_get_scheduler_data(THD *thd)
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{
  return thd->scheduler.data;
}

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/**
  Set reference to Scheduler data object for THD object

  @param thd            THD object
  @param psi            Scheduler data object to set on THD
*/
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void thd_set_scheduler_data(THD *thd, void *data)
{
  thd->scheduler.data= data;
}

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/**
  Get reference to Performance Schema object for THD object

  @param thd            THD object

  @retval               Performance schema object for thread on THD
*/
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PSI_thread *thd_get_psi(THD *thd)
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{
  return thd->scheduler.m_psi;
}

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/**
  Set reference to Performance Schema object for THD object

  @param thd            THD object
  @param psi            Performance schema object for thread
*/
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void thd_set_psi(THD *thd, PSI_thread *psi)
{
  thd->scheduler.m_psi= psi;
}

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/**
  Set the state on connection to killed

  @param thd               THD object
*/
void thd_set_killed(THD *thd)
{
  thd->killed= THD::KILL_CONNECTION;
}

/**
  Clear errors from the previous THD

  @param thd              THD object
*/
void thd_clear_errors(THD *thd)
{
  my_errno= 0;
  thd->mysys_var->abort= 0;
}

/**
  Set thread stack in THD object

  @param thd              Thread object
  @param stack_start      Start of stack to set in THD object
*/
void thd_set_thread_stack(THD *thd, char *stack_start)
{
  thd->thread_stack= stack_start;
}

/**
  Lock connection data for the set of connections this connection
  belongs to

  @param thd                       THD object
*/
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void thd_lock_thread_count(THD *)
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{
  mysql_mutex_lock(&LOCK_thread_count);
}

/**
  Lock connection data for the set of connections this connection
  belongs to

  @param thd                       THD object
*/
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void thd_unlock_thread_count(THD *)
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{
  mysql_cond_broadcast(&COND_thread_count);
  mysql_mutex_unlock(&LOCK_thread_count);
}

/**
  Close the socket used by this connection

  @param thd                THD object
*/
void thd_close_connection(THD *thd)
{
  if (thd->net.vio)
    vio_close(thd->net.vio);
}

/**
  Get current THD object from thread local data

  @retval     The THD object for the thread, NULL if not connection thread
*/
THD *thd_get_current_thd()
{
  return current_thd;
}

/**
  Set up various THD data for a new connection

  thd_new_connection_setup

  @param              thd            THD object
  @param              stack_start    Start of stack for connection
*/
void thd_new_connection_setup(THD *thd, char *stack_start)
{
#ifdef HAVE_PSI_INTERFACE
  if (PSI_server)
    thd_set_psi(thd,
                PSI_server->new_thread(key_thread_one_connection,
                                       thd,
                                       thd_get_thread_id((MYSQL_THD)thd)));
#endif
  thd->set_time();
  thd->prior_thr_create_utime= thd->thr_create_utime= thd->start_utime=
    my_micro_time();
  threads.append(thd);
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  thd_unlock_thread_count(thd);
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  DBUG_PRINT("info", ("init new connection. thd: 0x%lx fd: %d",
          (ulong)thd, thd->net.vio->sd));
  thd_set_thread_stack(thd, stack_start);
}

/**
  Lock data that needs protection in THD object

  @param thd                   THD object
*/
void thd_lock_data(THD *thd)
{
  mysql_mutex_lock(&thd->LOCK_thd_data);
}

/**
  Unlock data that needs protection in THD object

  @param thd                   THD object
*/
void thd_unlock_data(THD *thd)
{
  mysql_mutex_unlock(&thd->LOCK_thd_data);
}

/**
  Support method to check if connection has already started transcaction

  @param client_cntx    Low level client context

  @retval               TRUE if connection already started transaction
*/
bool thd_is_transaction_active(THD *thd)
{
  return thd->transaction.is_active();
}

/**
  Check if there is buffered data on the socket representing the connection

  @param thd                  THD object
*/
int thd_connection_has_data(THD *thd)
{
  Vio *vio= thd->net.vio;
  return vio->has_data(vio);
}

/**
  Set reading/writing on socket, used by SHOW PROCESSLIST

  @param thd                       THD object
  @param val                       Value to set it to (0 or 1)
*/
void thd_set_net_read_write(THD *thd, uint val)
{
  thd->net.reading_or_writing= val;
}

/**
  Set reference to mysys variable in THD object

  @param thd             THD object
  @param mysys_var       Reference to set
*/
void thd_set_mysys_var(THD *thd, st_my_thread_var *mysys_var)
{
  thd->set_mysys_var(mysys_var);
}

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/**
  Get socket file descriptor for this connection

  @param thd            THD object

  @retval               Socket of the connection
*/
my_socket thd_get_fd(THD *thd)
{
  return thd->net.vio->sd;
}

/**
  Get thread attributes for connection threads

  @retval      Reference to thread attribute for connection threads
*/
pthread_attr_t *get_connection_attrib(void)
{
  return &connection_attrib;
}

/**
  Get max number of connections

  @retval         Max number of connections for MySQL Server
*/
ulong get_max_connections(void)
{
  return max_connections;
}

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/*
  The following functions form part of the C plugin API
*/

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extern "C" int mysql_tmpfile(const char *prefix)
{
  char filename[FN_REFLEN];
  File fd = create_temp_file(filename, mysql_tmpdir, prefix,
#ifdef __WIN__
                             O_BINARY | O_TRUNC | O_SEQUENTIAL |
                             O_SHORT_LIVED |
#endif /* __WIN__ */
                             O_CREAT | O_EXCL | O_RDWR | O_TEMPORARY,
                             MYF(MY_WME));
  if (fd >= 0) {
#ifndef __WIN__
    /*
      This can be removed once the following bug is fixed:
      Bug #28903  create_temp_file() doesn't honor O_TEMPORARY option
                  (file not removed) (Unix)
    */
    unlink(filename);
#endif /* !__WIN__ */
  }

  return fd;
}


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extern "C"
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int thd_in_lock_tables(const THD *thd)
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{
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  return test(thd->in_lock_tables);
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}


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extern "C"
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int thd_tablespace_op(const THD *thd)
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{
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  return test(thd->tablespace_op);
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}


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extern "C"
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const char *set_thd_proc_info(void *thd_arg, const char *info,
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                              const char *calling_function,
                              const char *calling_file,
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                              const unsigned int calling_line)
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{
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  THD *thd= (THD *) thd_arg;

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  if (!thd)
    thd= current_thd;

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  const char *old_info= thd->proc_info;
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  DBUG_PRINT("proc_info", ("%s:%d  %s", calling_file, calling_line, info));
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#if defined(ENABLED_PROFILING)
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  thd->profiling.status_change(info,
                               calling_function, calling_file, calling_line);
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#endif
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  thd->proc_info= info;
  return old_info;
}

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extern "C"
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const char* thd_enter_cond(MYSQL_THD thd, mysql_cond_t *cond,
                           mysql_mutex_t *mutex, const char *msg)
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{
  if (!thd)
    thd= current_thd;

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  return thd->enter_cond(cond, mutex, msg);
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}

extern "C"
void thd_exit_cond(MYSQL_THD thd, const char *old_msg)
{
  if (!thd)
    thd= current_thd;

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  thd->exit_cond(old_msg);
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  return;
}

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extern "C"
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void **thd_ha_data(const THD *thd, const struct handlerton *hton)
{
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  return (void **) &thd->ha_data[hton->slot].ha_ptr;
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}

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extern "C"
void thd_storage_lock_wait(THD *thd, long long value)
{
  thd->utime_after_lock+= value;
}
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/**
  Provide a handler data getter to simplify coding
*/
extern "C"
void *thd_get_ha_data(const THD *thd, const struct handlerton *hton)
{
  return *thd_ha_data(thd, hton);
}


/**
  Provide a handler data setter to simplify coding
  @see thd_set_ha_data() definition in plugin.h
*/
extern "C"
void thd_set_ha_data(THD *thd, const struct handlerton *hton,
                     const void *ha_data)
{
  plugin_ref *lock= &thd->ha_data[hton->slot].lock;
  if (ha_data && !*lock)
    *lock= ha_lock_engine(NULL, (handlerton*) hton);
  else if (!ha_data && *lock)
  {
    plugin_unlock(NULL, *lock);
    *lock= NULL;
  }
  *thd_ha_data(thd, hton)= (void*) ha_data;
}


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extern "C"
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long long thd_test_options(const THD *thd, long long test_options)
{
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  return thd->variables.option_bits & test_options;
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}

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extern "C"
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int thd_sql_command(const THD *thd)
{
  return (int) thd->lex->sql_command;
}

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extern "C"
int thd_tx_isolation(const THD *thd)
{
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  return (int) thd->tx_isolation;
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}

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extern "C"
void thd_inc_row_count(THD *thd)
{
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  thd->warning_info->inc_current_row_for_warning();
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}
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/**
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  Dumps a text description of a thread, its security context
  (user, host) and the current query.
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  @param thd thread context
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  @param buffer pointer to preferred result buffer
  @param length length of buffer
  @param max_query_len how many chars of query to copy (0 for all)

  @req LOCK_thread_count
  
  @note LOCK_thread_count mutex is not necessary when the function is invoked on
   the currently running thread (current_thd) or if the caller in some other
   way guarantees that access to thd->query is serialized.
 
  @return Pointer to string
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*/
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extern "C"
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char *thd_security_context(THD *thd, char *buffer, unsigned int length,
                           unsigned int max_query_len)
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{
  String str(buffer, length, &my_charset_latin1);
  const Security_context *sctx= &thd->main_security_ctx;
  char header[64];
  int len;
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  /*
    The pointers thd->query and thd->proc_info might change since they are
    being modified concurrently. This is acceptable for proc_info since its
    values doesn't have to very accurate and the memory it points to is static,
    but we need to attempt a snapshot on the pointer values to avoid using NULL
    values. The pointer to thd->query however, doesn't point to static memory
    and has to be protected by LOCK_thread_count or risk pointing to
    uninitialized memory.
  */
  const char *proc_info= thd->proc_info;
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  len= my_snprintf(header, sizeof(header),
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                   "MySQL thread id %lu, OS thread handle 0x%lx, query id %lu",
                   thd->thread_id, (ulong) thd->real_id, (ulong) thd->query_id);
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  str.length(0);
  str.append(header, len);
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  if (sctx->host)
  {
    str.append(' ');
    str.append(sctx->host);
  }

  if (sctx->ip)
  {
    str.append(' ');
    str.append(sctx->ip);
  }

  if (sctx->user)
  {
    str.append(' ');
    str.append(sctx->user);
  }

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  if (proc_info)
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  {
    str.append(' ');
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    str.append(proc_info);
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  }

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  mysql_mutex_lock(&thd->LOCK_thd_data);
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  if (thd->query())
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  {
    if (max_query_len < 1)
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      len= thd->query_length();
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    else
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      len= min(thd->query_length(), max_query_len);
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    str.append('\n');
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    str.append(thd->query(), len);
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  }
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  mysql_mutex_unlock(&thd->LOCK_thd_data);
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  if (str.c_ptr_safe() == buffer)
    return buffer;
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  /*
    We have to copy the new string to the destination buffer because the string
    was reallocated to a larger buffer to be able to fit.
  */
  DBUG_ASSERT(buffer != NULL);
  length= min(str.length(), length-1);
  memcpy(buffer, str.c_ptr_quick(), length);
  /* Make sure that the new string is null terminated */
  buffer[length]= '\0';
  return buffer;
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}
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/**
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  Implementation of Drop_table_error_handler::handle_condition().
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  The reason in having this implementation is to silence technical low-level
  warnings during DROP TABLE operation. Currently we don't want to expose
  the following warnings during DROP TABLE:
    - Some of table files are missed or invalid (the table is going to be
      deleted anyway, so why bother that something was missed);
    - A trigger associated with the table does not have DEFINER (One of the
      MySQL specifics now is that triggers are loaded for the table being
      dropped. So, we may have a warning that trigger does not have DEFINER
      attribute during DROP TABLE operation).

  @return TRUE if the condition is handled.
*/
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bool Drop_table_error_handler::handle_condition(THD *thd,
                                                uint sql_errno,
                                                const char* sqlstate,
                                                MYSQL_ERROR::enum_warning_level level,
                                                const char* msg,
                                                MYSQL_ERROR ** cond_hdl)
{
  *cond_hdl= NULL;
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  return ((sql_errno == EE_DELETE && my_errno == ENOENT) ||
          sql_errno == ER_TRG_NO_DEFINER);
}


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THD::THD()
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   :Statement(&main_lex, &main_mem_root, STMT_CONVENTIONAL_EXECUTION,
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              /* statement id */ 0),
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   rli_fake(0),
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   user_time(0), in_sub_stmt(0),
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   binlog_unsafe_warning_flags(0),
   binlog_table_maps(0),
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   table_map_for_update(0),
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   arg_of_last_insert_id_function(FALSE),
   first_successful_insert_id_in_prev_stmt(0),
   first_successful_insert_id_in_prev_stmt_for_binlog(0),
   first_successful_insert_id_in_cur_stmt(0),
   stmt_depends_on_first_successful_insert_id_in_prev_stmt(FALSE),
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   examined_row_count(0),
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   warning_info(&main_warning_info),
   stmt_da(&main_da),
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   is_fatal_error(0),
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   transaction_rollback_request(0),
   is_fatal_sub_stmt_error(0),
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   rand_used(0),
   time_zone_used(0),
   in_lock_tables(0),
   bootstrap(0),
   derived_tables_processing(FALSE),
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   spcont(NULL),
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   m_parser_state(NULL),
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#if defined(ENABLED_DEBUG_SYNC)
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   debug_sync_control(0),
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#endif /* defined(ENABLED_DEBUG_SYNC) */
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   main_warning_info(0, false)
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{
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  ulong tmp;

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  mdl_context.init(this);
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  /*
    Pass nominal parameters to init_alloc_root only to ensure that
    the destructor works OK in case of an error. The main_mem_root
    will be re-initialized in init_for_queries().
  */
  init_sql_alloc(&main_mem_root, ALLOC_ROOT_MIN_BLOCK_SIZE, 0);
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  stmt_arena= this;
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  thread_stack= 0;
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  catalog= (char*)"std"; // the only catalog we have for now
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  main_security_ctx.init();
  security_ctx= &main_security_ctx;
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  no_errors= 0;
  password= 0;
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  query_start_used= 0;
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  count_cuted_fields= CHECK_FIELD_IGNORE;
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  killed= NOT_KILLED;
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  col_access=0;
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  is_slave_error= thread_specific_used= FALSE;
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  my_hash_clear(&handler_tables_hash);
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  tmp_table=0;
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  cuted_fields= 0L;
  sent_row_count= 0L;
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  limit_found_rows= 0;
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  m_row_count_func= -1;
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  statement_id_counter= 0UL;
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  // Must be reset to handle error with THD's created for init of mysqld
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  lex->current_select= 0;
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  start_time=(time_t) 0;
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  start_utime= prior_thr_create_utime= 0L;
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  utime_after_lock= 0L;
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  current_linfo =  0;
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  slave_thread = 0;
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  bzero(&variables, sizeof(variables));
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  thread_id= 0;
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  one_shot_set= 0;
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  file_id = 0;
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  query_id= 0;
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  query_name_consts= 0;
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  db_charset= global_system_variables.collation_database;
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  bzero(ha_data, sizeof(ha_data));
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  mysys_var=0;
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  binlog_evt_union.do_union= FALSE;
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  enable_slow_log= 0;
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#ifndef DBUG_OFF
  dbug_sentry=THD_SENTRY_MAGIC;
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#endif
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#ifndef EMBEDDED_LIBRARY
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  mysql_audit_init_thd(this);
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  net.vio=0;
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#endif
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  client_capabilities= 0;                       // minimalistic client
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  ull=0;
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  system_thread= NON_SYSTEM_THREAD;
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  cleanup_done= abort_on_warning= 0;
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  peer_port= 0;					// For SHOW PROCESSLIST
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  transaction.m_pending_rows_event= 0;
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  transaction.on= 1;
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#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
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#endif
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  mysql_mutex_init(key_LOCK_thd_data, &LOCK_thd_data, MY_MUTEX_INIT_FAST);
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  /* Variables with default values */
  proc_info="login";
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  where= THD::DEFAULT_WHERE;
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  server_id = ::server_id;
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  slave_net = 0;
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  command=COM_CONNECT;
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  *scramble= '\0';
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  /* Call to init() below requires fully initialized Open_tables_state. */
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  reset_open_tables_state(this);
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  init();
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#if defined(ENABLED_PROFILING)
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  profiling.set_thd(this);
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#endif
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  user_connect=(USER_CONN *)0;
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  my_hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_var_key,
               (my_hash_free_key) free_user_var, 0);
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  sp_proc_cache= NULL;
  sp_func_cache= NULL;
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  /* For user vars replication*/
  if (opt_bin_log)
    my_init_dynamic_array(&user_var_events,
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			  sizeof(BINLOG_USER_VAR_EVENT *), 16, 16);
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  else
    bzero((char*) &user_var_events, sizeof(user_var_events));

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  /* Protocol */
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  protocol= &protocol_text;			// Default protocol
  protocol_text.init(this);
  protocol_binary.init(this);
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  tablespace_op=FALSE;
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  tmp= sql_rnd_with_mutex();
  randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::global_query_id);
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  substitute_null_with_insert_id = FALSE;
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  thr_lock_info_init(&lock_info); /* safety: will be reset after start */
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  m_internal_handler= NULL;
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  m_binlog_invoker= FALSE;
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  memset(&invoker_user, 0, sizeof(invoker_user));
  memset(&invoker_host, 0, sizeof(invoker_host));
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}


void THD::push_internal_handler(Internal_error_handler *handler)
{
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  if (m_internal_handler)
  {
    handler->m_prev_internal_handler= m_internal_handler;
    m_internal_handler= handler;
  }
  else
  {
    m_internal_handler= handler;
  }
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}

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bool THD::handle_condition(uint sql_errno,
                           const char* sqlstate,
                           MYSQL_ERROR::enum_warning_level level,
                           const char* msg,
                           MYSQL_ERROR ** cond_hdl)
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{
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  if (!m_internal_handler)
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  {
    *cond_hdl= NULL;
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    return FALSE;
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  }
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  for (Internal_error_handler *error_handler= m_internal_handler;
       error_handler;
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       error_handler= error_handler->m_prev_internal_handler)
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  {
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    if (error_handler->handle_condition(this, sql_errno, sqlstate, level, msg,
					cond_hdl))
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    {
      return TRUE;
    }
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  }

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  return FALSE;
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}


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Internal_error_handler *THD::pop_internal_handler()
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{
  DBUG_ASSERT(m_internal_handler != NULL);
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  Internal_error_handler *popped_handler= m_internal_handler;
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  m_internal_handler= m_internal_handler->m_prev_internal_handler;
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  return popped_handler;
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}

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void THD::raise_error(uint sql_errno)
{
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_ERROR,
                         msg);
}

void THD::raise_error_printf(uint sql_errno, ...)
{
  va_list args;
  char ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_error_printf");
  DBUG_PRINT("my", ("nr: %d  errno: %d", sql_errno, errno));
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_ERROR,
                         ebuff);
  DBUG_VOID_RETURN;
}

void THD::raise_warning(uint sql_errno)
{
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_WARN,
                         msg);
}

void THD::raise_warning_printf(uint sql_errno, ...)
{
  va_list args;
  char    ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_warning_printf");
  DBUG_PRINT("enter", ("warning: %u", sql_errno));
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_WARN,
                         ebuff);
  DBUG_VOID_RETURN;
}

void THD::raise_note(uint sql_errno)
{
  DBUG_ENTER("THD::raise_note");
  DBUG_PRINT("enter", ("code: %d", sql_errno));
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  if (!(variables.option_bits & OPTION_SQL_NOTES))
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    DBUG_VOID_RETURN;
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_NOTE,
                         msg);
  DBUG_VOID_RETURN;
}

void THD::raise_note_printf(uint sql_errno, ...)
{
  va_list args;
  char    ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_note_printf");
  DBUG_PRINT("enter",("code: %u", sql_errno));
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  if (!(variables.option_bits & OPTION_SQL_NOTES))
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    DBUG_VOID_RETURN;
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_NOTE,
                         ebuff);
  DBUG_VOID_RETURN;
}

MYSQL_ERROR* THD::raise_condition(uint sql_errno,
                                  const char* sqlstate,
                                  MYSQL_ERROR::enum_warning_level level,
                                  const char* msg)
{
  MYSQL_ERROR *cond= NULL;
  DBUG_ENTER("THD::raise_condition");

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  if (!(variables.option_bits & OPTION_SQL_NOTES) &&
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      (level == MYSQL_ERROR::WARN_LEVEL_NOTE))
    DBUG_RETURN(NULL);

  warning_info->opt_clear_warning_info(query_id);

  /*
    TODO: replace by DBUG_ASSERT(sql_errno != 0) once all bugs similar to
    Bug#36768 are fixed: a SQL condition must have a real (!=0) error number
    so that it can be caught by handlers.
  */
  if (sql_errno == 0)
    sql_errno= ER_UNKNOWN_ERROR;
  if (msg == NULL)
    msg= ER(sql_errno);
  if (sqlstate == NULL)
   sqlstate= mysql_errno_to_sqlstate(sql_errno);

  if ((level == MYSQL_ERROR::WARN_LEVEL_WARN) &&
      really_abort_on_warning())
  {
    /*
      FIXME:
      push_warning and strict SQL_MODE case.
    */
    level= MYSQL_ERROR::WARN_LEVEL_ERROR;
    killed= THD::KILL_BAD_DATA;
  }

  switch (level)
  {
  case MYSQL_ERROR::WARN_LEVEL_NOTE:
  case MYSQL_ERROR::WARN_LEVEL_WARN:
    got_warning= 1;
    break;
  case MYSQL_ERROR::WARN_LEVEL_ERROR:
    break;
  default:
    DBUG_ASSERT(FALSE);
  }

  if (handle_condition(sql_errno, sqlstate, level, msg, &cond))
    DBUG_RETURN(cond);

  if (level == MYSQL_ERROR::WARN_LEVEL_ERROR)
  {
    is_slave_error=  1; // needed to catch query errors during replication

    /*
      thd->lex->current_select == 0 if lex structure is not inited
      (not query command (COM_QUERY))
    */
    if (lex->current_select &&
        lex->current_select->no_error && !is_fatal_error)
    {
      DBUG_PRINT("error",
                 ("Error converted to warning: current_select: no_error %d  "
                  "fatal_error: %d",
                  (lex->current_select ?
                   lex->current_select->no_error : 0),
                  (int) is_fatal_error));
    }
    else
    {
      if (! stmt_da->is_error())
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      {
        set_row_count_func(-1);
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        stmt_da->set_error_status(this, sql_errno, msg, sqlstate);
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      }
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    }
  }

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  query_cache_abort(&query_cache_tls);
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  /* When simulating OOM, skip writing to error log to avoid mtr errors */
  DBUG_EXECUTE_IF("simulate_out_of_memory", DBUG_RETURN(NULL););

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  cond= warning_info->push_warning(this, sql_errno, sqlstate, level, msg);
  DBUG_RETURN(cond);
}
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extern "C"
void *thd_alloc(MYSQL_THD thd, unsigned int size)
{
  return thd->alloc(size);
}

extern "C"
void *thd_calloc(MYSQL_THD thd, unsigned int size)
{
  return thd->calloc(size);
}

extern "C"
char *thd_strdup(MYSQL_THD thd, const char *str)
{
  return thd->strdup(str);
}

extern "C"
char *thd_strmake(MYSQL_THD thd, const char *str, unsigned int size)
{
  return thd->strmake(str, size);
}

extern "C"
LEX_STRING *thd_make_lex_string(THD *thd, LEX_STRING *lex_str,
                                const char *str, unsigned int size,
                                int allocate_lex_string)
{
  return thd->make_lex_string(lex_str, str, size,
                              (bool) allocate_lex_string);
}

extern "C"
void *thd_memdup(MYSQL_THD thd, const void* str, unsigned int size)
{
  return thd->memdup(str, size);
}

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extern "C"
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void thd_get_xid(const MYSQL_THD thd, MYSQL_XID *xid)
{
  *xid = *(MYSQL_XID *) &thd->transaction.xid_state.xid;
}
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#ifdef _WIN32
extern "C"   THD *_current_thd_noinline(void)
{
  return my_pthread_getspecific_ptr(THD*,THR_THD);
}
#endif
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/*
  Init common variables that has to be reset on start and on change_user
*/

void THD::init(void)
{
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  mysql_mutex_lock(&LOCK_global_system_variables);
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  plugin_thdvar_init(this);
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  /*
    variables= global_system_variables above has reset
    variables.pseudo_thread_id to 0. We need to correct it here to
    avoid temporary tables replication failure.
  */
  variables.pseudo_thread_id= thread_id;
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  mysql_mutex_unlock(&LOCK_global_system_variables);
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  server_status= SERVER_STATUS_AUTOCOMMIT;
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  if (variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)
    server_status|= SERVER_STATUS_NO_BACKSLASH_ESCAPES;
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  transaction.all.modified_non_trans_table=
    transaction.stmt.modified_non_trans_table= FALSE;
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  open_options=ha_open_options;
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  update_lock_default= (variables.low_priority_updates ?
			TL_WRITE_LOW_PRIORITY :
			TL_WRITE);
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  tx_isolation= (enum_tx_isolation) variables.tx_isolation;
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  update_charset();
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  reset_current_stmt_binlog_format_row();
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  bzero((char *) &status_var, sizeof(status_var));
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  if (variables.sql_log_bin)
    variables.option_bits|= OPTION_BIN_LOG;
  else
    variables.option_bits&= ~OPTION_BIN_LOG;
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#if defined(ENABLED_DEBUG_SYNC)
  /* Initialize the Debug Sync Facility. See debug_sync.cc. */
  debug_sync_init_thread(this);
#endif /* defined(ENABLED_DEBUG_SYNC) */
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}

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/*
  Init THD for query processing.
  This has to be called once before we call mysql_parse.
  See also comments in sql_class.h.
*/

void THD::init_for_queries()
{
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  set_time(); 
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  ha_enable_transaction(this,TRUE);
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  reset_root_defaults(mem_root, variables.query_alloc_block_size,
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                      variables.query_prealloc_size);
  reset_root_defaults(&transaction.mem_root,
                      variables.trans_alloc_block_size,
                      variables.trans_prealloc_size);
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  transaction.xid_state.xid.null();
  transaction.xid_state.in_thd=1;
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}


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/*
  Do what's needed when one invokes change user

  SYNOPSIS
    change_user()

  IMPLEMENTATION
    Reset all resources that are connection specific
*/


void THD::change_user(void)
{
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  mysql_mutex_lock(&LOCK_status);
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  add_to_status(&global_status_var, &status_var);
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  mysql_mutex_unlock(&LOCK_status);
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  cleanup();
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  killed= NOT_KILLED;
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  cleanup_done= 0;
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  init();
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  stmt_map.reset();
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  my_hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_var_key,
               (my_hash_free_key) free_user_var, 0);
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  sp_cache_clear(&sp_proc_cache);
  sp_cache_clear(&sp_func_cache);
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}


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/* Do operations that may take a long time */

void THD::cleanup(void)
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{
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  DBUG_ENTER("THD::cleanup");
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  DBUG_ASSERT(cleanup_done == 0);

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  killed= KILL_CONNECTION;
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#ifdef ENABLE_WHEN_BINLOG_WILL_BE_ABLE_TO_PREPARE
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  if (transaction.xid_state.xa_state == XA_PREPARED)
  {
#error xid_state in the cache should be replaced by the allocated value
  }
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#endif
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  {
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    transaction.xid_state.xa_state= XA_NOTR;
    trans_rollback(this);
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    xid_cache_delete(&transaction.xid_state);
  }
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  locked_tables_list.unlock_locked_tables(this);
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  mysql_ha_cleanup(this);
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  DBUG_ASSERT(open_tables == NULL);
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  /*
    If the thread was in the middle of an ongoing transaction (rolled
    back a few lines above) or under LOCK TABLES (unlocked the tables
    and left the mode a few lines above), there will be outstanding
    metadata locks. Release them.
  */
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  mdl_context.release_transactional_locks();
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  /* Release the global read lock, if acquired. */
  if (global_read_lock.is_acquired())
    global_read_lock.unlock_global_read_lock(this);

  /* All metadata locks must have been released by now. */
  DBUG_ASSERT(!mdl_context.has_locks());

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#if defined(ENABLED_DEBUG_SYNC)
  /* End the Debug Sync Facility. See debug_sync.cc. */
  debug_sync_end_thread(this);
#endif /* defined(ENABLED_DEBUG_SYNC) */

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  delete_dynamic(&user_var_events);
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  my_hash_free(&user_vars);
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  close_temporary_tables(this);
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  sp_cache_clear(&sp_proc_cache);
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  sp_cache_clear(&sp_func_cache);

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  if (ull)
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  {
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    mysql_mutex_lock(&LOCK_user_locks);
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    item_user_lock_release(ull);
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    mysql_mutex_unlock(&LOCK_user_locks);
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    ull= NULL;
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  }
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  cleanup_done=1;
  DBUG_VOID_RETURN;
}

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THD::~THD()
{
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  THD_CHECK_SENTRY(this);
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  DBUG_ENTER("~THD()");
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  /* Ensure that no one is using THD */
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  mysql_mutex_lock(&LOCK_thd_data);
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  mysys_var=0;					// Safety (shouldn't be needed)
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  mysql_mutex_unlock(&LOCK_thd_data);
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  add_to_status(&global_status_var, &status_var);
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  /* Close connection */
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#ifndef EMBEDDED_LIBRARY
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  if (net.vio)
  {
    vio_delete(net.vio);
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    net_end(&net);
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  }
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#endif
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  stmt_map.reset();                     /* close all prepared statements */
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  if (!cleanup_done)
    cleanup();
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  mdl_context.destroy();
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  ha_close_connection(this);
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  mysql_audit_release(this);
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  plugin_thdvar_cleanup(this);
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  DBUG_PRINT("info", ("freeing security context"));
  main_security_ctx.destroy();
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  my_free(db);
  db= NULL;
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  free_root(&transaction.mem_root,MYF(0));
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  mysql_mutex_destroy(&LOCK_thd_data);
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#ifndef DBUG_OFF
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  dbug_sentry= THD_SENTRY_GONE;
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#endif  
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#ifndef EMBEDDED_LIBRARY
  if (rli_fake)
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  {
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    delete rli_fake;
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    rli_fake= NULL;
  }
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  mysql_audit_free_thd(this);
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#endif

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  free_root(&main_mem_root, MYF(0));
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  DBUG_VOID_RETURN;
}

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/*
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  Add all status variables to another status variable array

  SYNOPSIS
   add_to_status()
   to_var       add to this array
   from_var     from this array
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  NOTES
    This function assumes that all variables are long/ulong.
    If this assumption will change, then we have to explictely add
    the other variables after the while loop
*/

void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var)
{
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  ulong *end= (ulong*) ((uchar*) to_var +
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                        offsetof(STATUS_VAR, last_system_status_var) +
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			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var;

  while (to != end)
    *(to++)+= *(from++);
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  to_var->bytes_received+= from_var->bytes_received;
  to_var->bytes_sent+= from_var->bytes_sent;
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}

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/*
  Add the difference between two status variable arrays to another one.

  SYNOPSIS
    add_diff_to_status
    to_var       add to this array
    from_var     from this array
    dec_var      minus this array
  
  NOTE
    This function assumes that all variables are long/ulong.
*/

void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
                        STATUS_VAR *dec_var)
{
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  ulong *end= (ulong*) ((uchar*) to_var + offsetof(STATUS_VAR,
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						  last_system_status_var) +
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var, *dec= (ulong*) dec_var;

  while (to != end)
    *(to++)+= *(from++) - *(dec++);
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  to_var->bytes_received+= from_var->bytes_received - dec_var->bytes_received;;
  to_var->bytes_sent+= from_var->bytes_sent - dec_var->bytes_sent;
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}

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/**
  Awake a thread.

  @param[in]  state_to_set    value for THD::killed

  This is normally called from another thread's THD object.

  @note Do always call this while holding LOCK_thd_data.
*/

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void THD::awake(THD::killed_state state_to_set)
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{
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  DBUG_ENTER("THD::awake");
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  DBUG_PRINT("enter", ("this: %p current_thd: %p", this, current_thd));
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  THD_CHECK_SENTRY(this);
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  mysql_mutex_assert_owner(&LOCK_thd_data);
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  /* Set the 'killed' flag of 'this', which is the target THD object. */
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  killed= state_to_set;
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  if (state_to_set != THD::KILL_QUERY)
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  {
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#ifdef SIGNAL_WITH_VIO_CLOSE
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    if (this != current_thd)
    {
      /*
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        Before sending a signal, let's close the socket of the thread
        that is being killed ("this", which is not the current thread).
        This is to make sure it does not block if the signal is lost.
        This needs to be done only on platforms where signals are not
        a reliable interruption mechanism.

        Note that the downside of this mechanism is that we could close
        the connection while "this" target thread is in the middle of
        sending a result to the application, thus violating the client-
        server protocol.

        On the other hand, without closing the socket we have a race
        condition. If "this" target thread passes the check of
        thd->killed, and then the current thread runs through
        THD::awake(), sets the 'killed' flag and completes the
        signaling, and then the target thread runs into read(), it will
        block on the socket. As a result of the discussions around
        Bug#37780, it has been decided that we accept the race
        condition. A second KILL awakes the target from read().

        If we are killing ourselves, we know that we are not blocked.
        We also know that we will check thd->killed before we go for
        reading the next statement.
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      */

      close_active_vio();
    }
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#endif

    /* Mark the target thread's alarm request expired, and signal alarm. */
    thr_alarm_kill(thread_id);

    /* Send an event to the scheduler that a thread should be killed. */
    if (!slave_thread)
      MYSQL_CALLBACK(thread_scheduler, post_kill_notification, (this));
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  }
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  /* Broadcast a condition to kick the target if it is waiting on it. */
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  if (mysys_var)
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  {
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    mysql_mutex_lock(&mysys_var->mutex);
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    if (!system_thread)		// Don't abort locks
      mysys_var->abort=1;
    /*
      This broadcast could be up in the air if the victim thread
      exits the cond in the time between read and broadcast, but that is
      ok since all we want to do is to make the victim thread get out
      of waiting on current_cond.
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      If we see a non-zero current_cond: it cannot be an old value (because
      then exit_cond() should have run and it can't because we have mutex); so
      it is the true value but maybe current_mutex is not yet non-zero (we're
      in the middle of enter_cond() and there is a "memory order
      inversion"). So we test the mutex too to not lock 0.
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      Note that there is a small chance we fail to kill. If victim has locked
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      current_mutex, but hasn't yet entered enter_cond() (which means that
      current_cond and current_mutex are 0), then the victim will not get
      a signal and it may wait "forever" on the cond (until
      we issue a second KILL or the status it's waiting for happens).
      It's true that we have set its thd->killed but it may not
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      see it immediately and so may have time to reach the cond_wait().
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      However, where possible, we test for killed once again after
      enter_cond(). This should make the signaling as safe as possible.
      However, there is still a small chance of failure on platforms with
      instruction or memory write reordering.
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    */
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    if (mysys_var->current_cond && mysys_var->current_mutex)
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    {
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      mysql_mutex_lock(mysys_var->current_mutex);
      mysql_cond_broadcast(mysys_var->current_cond);
      mysql_mutex_unlock(mysys_var->current_mutex);
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    }
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    mysql_mutex_unlock(&mysys_var->mutex);
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  }
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  DBUG_VOID_RETURN;
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}

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/**
  Close the Vio associated this session.

  @remark LOCK_thd_data is taken due to the fact that
          the Vio might be disassociated concurrently.
*/

void THD::disconnect()
{
  Vio *vio= NULL;

  mysql_mutex_lock(&LOCK_thd_data);

  killed= THD::KILL_CONNECTION;

#ifdef SIGNAL_WITH_VIO_CLOSE
  /*
    Since a active vio might might have not been set yet, in
    any case save a reference to avoid closing a inexistent
    one or closing the vio twice if there is a active one.
  */
  vio= active_vio;
  close_active_vio();
#endif

  /* Disconnect even if a active vio is not associated. */
  if (net.vio != vio)
    vio_close(net.vio);

  mysql_mutex_unlock(&LOCK_thd_data);
}


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/*
  Remember the location of thread info, the structure needed for
  sql_alloc() and the structure for the net buffer
*/
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bool THD::store_globals()
{
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  /*
    Assert that thread_stack is initialized: it's necessary to be able
    to track stack overrun.
  */
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  DBUG_ASSERT(thread_stack);
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  if (my_pthread_setspecific_ptr(THR_THD,  this) ||
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      my_pthread_setspecific_ptr(THR_MALLOC, &mem_root))
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    return 1;
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  /*
    mysys_var is concurrently readable by a killer thread.
    It is protected by LOCK_thd_data, it is not needed to lock while the
    pointer is changing from NULL not non-NULL. If the kill thread reads
    NULL it doesn't refer to anything, but if it is non-NULL we need to
    ensure that the thread doesn't proceed to assign another thread to
    have the mysys_var reference (which in fact refers to the worker
    threads local storage with key THR_KEY_mysys. 
  */
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  mysys_var=my_thread_var;
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  /*
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    Let mysqld define the thread id (not mysys)
    This allows us to move THD to different threads if needed.
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  */
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  mysys_var->id= thread_id;
  real_id= pthread_self();                      // For debugging

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  /*
    We have to call thr_lock_info_init() again here as THD may have been
    created in another thread
  */
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  thr_lock_info_init(&lock_info);
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  return 0;
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}

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/*
  Remove the thread specific info (THD and mem_root pointer) stored during
  store_global call for this thread.
*/
bool THD::restore_globals()
{
  /*
    Assert that thread_stack is initialized: it's necessary to be able
    to track stack overrun.
  */
  DBUG_ASSERT(thread_stack);
  
  /* Undocking the thread specific data. */
  my_pthread_setspecific_ptr(THR_THD, NULL);
  my_pthread_setspecific_ptr(THR_MALLOC, NULL);
  
  return 0;
}

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/*
  Cleanup after query.

  SYNOPSIS
    THD::cleanup_after_query()
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  DESCRIPTION
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    This function is used to reset thread data to its default state.
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  NOTE
    This function is not suitable for setting thread data to some
    non-default values, as there is only one replication thread, so
    different master threads may overwrite data of each other on
    slave.
*/
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void THD::cleanup_after_query()
{
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  /*
    Reset rand_used so that detection of calls to rand() will save random 
    seeds if needed by the slave.

    Do not reset rand_used if inside a stored function or trigger because 
    only the call to these operations is logged. Thus only the calling 
    statement needs to detect rand() calls made by its substatements. These
    substatements must not set rand_used to 0 because it would remove the
    detection of rand() by the calling statement. 
  */
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  if (!in_sub_stmt) /* stored functions and triggers are a special case */
  {
    /* Forget those values, for next binlogger: */
    stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;
    auto_inc_intervals_in_cur_stmt_for_binlog.empty();
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    rand_used= 0;
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  }
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  if (first_successful_insert_id_in_cur_stmt > 0)
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  {
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    /* set what LAST_INSERT_ID() will return */
    first_successful_insert_id_in_prev_stmt= 
      first_successful_insert_id_in_cur_stmt;
    first_successful_insert_id_in_cur_stmt= 0;
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    substitute_null_with_insert_id= TRUE;
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  }
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  arg_of_last_insert_id_function= 0;
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  /* Free Items that were created during this execution */
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  free_items();
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  /* Reset where. */
  where= THD::DEFAULT_WHERE;
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  /* reset table map for multi-table update */
  table_map_for_update= 0;
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  m_binlog_invoker= FALSE;
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}

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LEX_STRING *
make_lex_string_root(MEM_ROOT *mem_root,
                     LEX_STRING *lex_str, const char* str, uint length,
                     bool allocate_lex_string)
{
  if (allocate_lex_string)
    if (!(lex_str= (LEX_STRING *)alloc_root(mem_root, sizeof(LEX_STRING))))
      return 0;
  if (!(lex_str->str= strmake_root(mem_root, str, length)))
    return 0;
  lex_str->length= length;
  return lex_str;
}

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/**
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  Create a LEX_STRING in this connection.
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  @param lex_str  pointer to LEX_STRING object to be initialized
  @param str      initializer to be copied into lex_str
  @param length   length of str, in bytes
  @param allocate_lex_string  if TRUE, allocate new LEX_STRING object,
                              instead of using lex_str value
  @return  NULL on failure, or pointer to the LEX_STRING object
*/
LEX_STRING *THD::make_lex_string(LEX_STRING *lex_str,
                                 const char* str, uint length,
                                 bool allocate_lex_string)
{
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  return make_lex_string_root (mem_root, lex_str, str,
                               length, allocate_lex_string);
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}


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/*
  Convert a string to another character set

  SYNOPSIS
    convert_string()
    to				Store new allocated string here
    to_cs			New character set for allocated string
    from			String to convert
    from_length			Length of string to convert
    from_cs			Original character set

  NOTES
    to will be 0-terminated to make it easy to pass to system funcs

  RETURN
    0	ok
    1	End of memory.
        In this case to->str will point to 0 and to->length will be 0.
*/

bool THD::convert_string(LEX_STRING *to, CHARSET_INFO *to_cs,
			 const char *from, uint from_length,
			 CHARSET_INFO *from_cs)
{
  DBUG_ENTER("convert_string");
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  size_t new_length= to_cs->mbmaxlen * from_length;
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  uint dummy_errors;
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  if (!(to->str= (char*) alloc(new_length+1)))
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  {
    to->length= 0;				// Safety fix
    DBUG_RETURN(1);				// EOM
  }
  to->length= copy_and_convert((char*) to->str, new_length, to_cs,
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			       from, from_length, from_cs, &dummy_errors);
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  to->str[to->length]=0;			// Safety
  DBUG_RETURN(0);
}


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/*
  Convert string from source character set to target character set inplace.

  SYNOPSIS
    THD::convert_string

  DESCRIPTION
    Convert string using convert_buffer - buffer for character set 
    conversion shared between all protocols.

  RETURN
    0   ok
   !0   out of memory
*/

bool THD::convert_string(String *s, CHARSET_INFO *from_cs, CHARSET_INFO *to_cs)
{
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  uint dummy_errors;
  if (convert_buffer.copy(s->ptr(), s->length(), from_cs, to_cs, &dummy_errors))
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    return TRUE;
  /* If convert_buffer >> s copying is more efficient long term */
  if (convert_buffer.alloced_length() >= convert_buffer.length() * 2 ||
      !s->is_alloced())
  {
    return s->copy(convert_buffer);
  }
  s->swap(convert_buffer);
  return FALSE;
}

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/*
  Update some cache variables when character set changes
*/

void THD::update_charset()
{
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  uint32 not_used;
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  charset_is_system_charset=
    !String::needs_conversion(0,
                              variables.character_set_client,
                              system_charset_info,
                              &not_used);
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  charset_is_collation_connection= 
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    !String::needs_conversion(0,
                              variables.character_set_client,
                              variables.collation_connection,
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                              &not_used);
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  charset_is_character_set_filesystem= 
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    !String::needs_conversion(0,
                              variables.character_set_client,
                              variables.character_set_filesystem,
                              &not_used);
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}


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/* routings to adding tables to list of changed in transaction tables */

inline static void list_include(CHANGED_TABLE_LIST** prev,
				CHANGED_TABLE_LIST* curr,
				CHANGED_TABLE_LIST* new_table)
{
  if (new_table)
  {
    *prev = new_table;
    (*prev)->next = curr;
  }
}

/* add table to list of changed in transaction tables */
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void THD::add_changed_table(TABLE *table)
{
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  DBUG_ENTER("THD::add_changed_table(table)");
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  DBUG_ASSERT(in_multi_stmt_transaction_mode() && table->file->has_transactions());
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  add_changed_table(table->s->table_cache_key.str,
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                    (long) table->s->table_cache_key.length);
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  DBUG_VOID_RETURN;
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}
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void THD::add_changed_table(const char *key, long key_length)
{
  DBUG_ENTER("THD::add_changed_table(key)");
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  CHANGED_TABLE_LIST **prev_changed = &transaction.changed_tables;
  CHANGED_TABLE_LIST *curr = transaction.changed_tables;
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  for (; curr; prev_changed = &(curr->next), curr = curr->next)
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  {
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    int cmp =  (long)curr->key_length - (long)key_length;
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    if (cmp < 0)
    {
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      list_include(prev_changed, curr, changed_table_dup(key, key_length));
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      DBUG_PRINT("info", 
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		 ("key_length: %ld  %u", key_length,
                  (*prev_changed)->key_length));
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      DBUG_VOID_RETURN;
    }
    else if (cmp == 0)
    {
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      cmp = memcmp(curr->key, key, curr->key_length);
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      if (cmp < 0)
      {
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	list_include(prev_changed, curr, changed_table_dup(key, key_length));
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	DBUG_PRINT("info", 
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		   ("key_length:  %ld  %u", key_length,
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		    (*prev_changed)->key_length));
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	DBUG_VOID_RETURN;
      }
      else if (cmp == 0)
      {
	DBUG_PRINT("info", ("already in list"));
	DBUG_VOID_RETURN;
      }
    }
  }
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  *prev_changed = changed_table_dup(key, key_length);
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  DBUG_PRINT("info", ("key_length: %ld  %u", key_length,
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		      (*prev_changed)->key_length));
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  DBUG_VOID_RETURN;
}

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CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
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{
  CHANGED_TABLE_LIST* new_table = 
    (CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+
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				      key_length + 1);
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  if (!new_table)
  {
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    my_error(EE_OUTOFMEMORY, MYF(ME_BELL),
             ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1);
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    killed= KILL_CONNECTION;
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    return 0;
  }

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  new_table->key= ((char*)new_table)+ ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST));
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  new_table->next = 0;
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  new_table->key_length = key_length;
  ::memcpy(new_table->key, key, key_length);
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  return new_table;
}

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int THD::send_explain_fields(select_result *result)
{
  List<Item> field_list;
  Item *item;
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  CHARSET_INFO *cs= system_charset_info;
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  field_list.push_back(new Item_return_int("id",3, MYSQL_TYPE_LONGLONG));
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  field_list.push_back(new Item_empty_string("select_type", 19, cs));
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  field_list.push_back(item= new Item_empty_string("table", NAME_CHAR_LEN, cs));
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  item->maybe_null= 1;
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  if (lex->describe & DESCRIBE_PARTITIONS)
  {
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    /* Maximum length of string that make_used_partitions_str() can produce */
    item= new Item_empty_string("partitions", MAX_PARTITIONS * (1 + FN_LEN),
                                cs);
    field_list.push_back(item);
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    item->maybe_null= 1;
  }
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  field_list.push_back(item= new Item_empty_string("type", 10, cs));
  item->maybe_null= 1;
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  field_list.push_back(item=new Item_empty_string("possible_keys",
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						  NAME_CHAR_LEN*MAX_KEY, cs));
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  item->maybe_null=1;
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  field_list.push_back(item=new Item_empty_string("key", NAME_CHAR_LEN, cs));
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  item->maybe_null=1;
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  field_list.push_back(item=new Item_empty_string("key_len",
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						  NAME_CHAR_LEN*MAX_KEY));
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  item->maybe_null=1;
  field_list.push_back(item=new Item_empty_string("ref",
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                                                  NAME_CHAR_LEN*MAX_REF_PARTS,
                                                  cs));
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  item->maybe_null=1;
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  field_list.push_back(item= new Item_return_int("rows", 10,
                                                 MYSQL_TYPE_LONGLONG));
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  if (lex->describe & DESCRIBE_EXTENDED)
  {
    field_list.push_back(item= new Item_float("filtered", 0.1234, 2, 4));
    item->maybe_null=1;
  }
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  item->maybe_null= 1;
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  field_list.push_back(new Item_empty_string("Extra", 255, cs));
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  return (result->send_result_set_metadata(field_list,
                                           Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF));
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}
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#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
{
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  DBUG_ENTER("close_active_vio");
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  mysql_mutex_assert_owner(&LOCK_thd_data);
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#ifndef EMBEDDED_LIBRARY
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  if (active_vio)
  {
    vio_close(active_vio);
    active_vio = 0;
  }
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#endif
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  DBUG_VOID_RETURN;
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}
#endif

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struct Item_change_record: public ilink
{
  Item **place;
  Item *old_value;
  /* Placement new was hidden by `new' in ilink (TODO: check): */
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  static void *operator new(size_t size, void *mem) { return mem; }
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  static void operator delete(void *ptr, size_t size) {}
  static void operator delete(void *ptr, void *mem) { /* never called */ }
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};


/*
  Register an item tree tree transformation, performed by the query
  optimizer. We need a pointer to runtime_memroot because it may be !=
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  thd->mem_root (due to possible set_n_backup_active_arena called for thd).
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*/

void THD::nocheck_register_item_tree_change(Item **place, Item *old_value,
                                            MEM_ROOT *runtime_memroot)
{
  Item_change_record *change;
  /*
    Now we use one node per change, which adds some memory overhead,
    but still is rather fast as we use alloc_root for allocations.
    A list of item tree changes of an average query should be short.
  */
  void *change_mem= alloc_root(runtime_memroot, sizeof(*change));
  if (change_mem == 0)
  {
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    /*
      OOM, thd->fatal_error() is called by the error handler of the
      memroot. Just return.
    */
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    return;
  }
  change= new (change_mem) Item_change_record;
  change->place= place;
  change->old_value= old_value;
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  change_list.append(change);
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}


void THD::rollback_item_tree_changes()
{
  I_List_iterator<Item_change_record> it(change_list);
  Item_change_record *change;
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  DBUG_ENTER("rollback_item_tree_changes");

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  while ((change= it++))
    *change->place= change->old_value;
  /* We can forget about changes memory: it's allocated in runtime memroot */
  change_list.empty();
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  DBUG_VOID_RETURN;
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}


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/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/

select_result::select_result()
{
  thd=current_thd;
}

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void select_result::send_error(uint errcode,const char *err)
{
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  my_message(errcode, err, MYF(0));
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}

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void select_result::cleanup()
{
  /* do nothing */
}

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bool select_result::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_QUERY, MYF(0));
  return TRUE;
}


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static String default_line_term("\n",default_charset_info);
static String default_escaped("\\",default_charset_info);
static String default_field_term("\t",default_charset_info);
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static String default_xml_row_term("<row>", default_charset_info);
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sql_exchange::sql_exchange(char *name, bool flag,
                           enum enum_filetype filetype_arg)
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  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
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  filetype= filetype_arg;
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  field_term= &default_field_term;
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  enclosed=   line_start= &my_empty_string;
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  line_term=  filetype == FILETYPE_CSV ?
              &default_line_term : &default_xml_row_term;
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  escaped=    &default_escaped;
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  cs= NULL;
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}

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bool sql_exchange::escaped_given(void)
{
  return escaped != &default_escaped;
}


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bool select_send::send_result_set_metadata(List<Item> &list, uint flags)
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{
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  bool res;
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  if (!(res= thd->protocol->send_result_set_metadata(&list, flags)))
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    is_result_set_started= 1;
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  return res;
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}

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void select_send::abort_result_set()
2073
{
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  DBUG_ENTER("select_send::abort_result_set");
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  if (is_result_set_started && thd->spcont)
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  {
    /*
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      We're executing a stored procedure, have an open result
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      set and an SQL exception condition. In this situation we
      must abort the current statement, silence the error and
      start executing the continue/exit handler if one is found.
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      Before aborting the statement, let's end the open result set, as
      otherwise the client will hang due to the violation of the
      client/server protocol.
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    */
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    thd->spcont->end_partial_result_set= TRUE;
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  }
  DBUG_VOID_RETURN;
}


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/** 
  Cleanup an instance of this class for re-use
  at next execution of a prepared statement/
  stored procedure statement.
*/

void select_send::cleanup()
{
  is_result_set_started= FALSE;
}

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/* Send data to client. Returns 0 if ok */

bool select_send::send_data(List<Item> &items)
{
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  Protocol *protocol= thd->protocol;
  DBUG_ENTER("select_send::send_data");

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  if (unit->offset_limit_cnt)
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  {						// using limit offset,count
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    unit->offset_limit_cnt--;
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    DBUG_RETURN(FALSE);
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  }
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  /*
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd
  */
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  ha_release_temporary_latches(thd);
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  protocol->prepare_for_resend();
2125
  if (protocol->send_result_set_row(&items))
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  {
    protocol->remove_last_row();
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    DBUG_RETURN(TRUE);
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  }
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  thd->sent_row_count++;

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  if (thd->vio_ok())
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    DBUG_RETURN(protocol->write());
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  DBUG_RETURN(0);
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}

bool select_send::send_eof()
{
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  /* 
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd 
  */
  ha_release_temporary_latches(thd);
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  /* 
    Don't send EOF if we're in error condition (which implies we've already
    sent or are sending an error)
  */
  if (thd->is_error())
    return TRUE;
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  ::my_eof(thd);
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  is_result_set_started= 0;
  return FALSE;
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}


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/************************************************************************
  Handling writing to file
************************************************************************/
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void select_to_file::send_error(uint errcode,const char *err)
{
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  my_message(errcode, err, MYF(0));
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  if (file > 0)
  {
    (void) end_io_cache(&cache);
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    mysql_file_close(file, MYF(0));
    /* Delete file on error */
    mysql_file_delete(key_select_to_file, path, MYF(0));
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    file= -1;
  }
}
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bool select_to_file::send_eof()
{
  int error= test(end_io_cache(&cache));
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  if (mysql_file_close(file, MYF(MY_WME)) || thd->is_error())
    error= true;

2184
  if (!error)
2185
  {
2186
    ::my_ok(thd,row_count);
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  }
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  file= -1;
  return error;
}


void select_to_file::cleanup()
{
  /* In case of error send_eof() may be not called: close the file here. */
  if (file >= 0)
  {
    (void) end_io_cache(&cache);
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    mysql_file_close(file, MYF(0));
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    file= -1;
  }
  path[0]= '\0';
  row_count= 0;
}


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select_to_file::~select_to_file()
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{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
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    mysql_file_close(file, MYF(0));
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    file= -1;
  }
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}

/***************************************************************************
** Export of select to textfile
***************************************************************************/

select_export::~select_export()
{
2223
  thd->sent_row_count=row_count;
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}

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/*
  Create file with IO cache

  SYNOPSIS
    create_file()
    thd			Thread handle
    path		File name
    exchange		Excange class
    cache		IO cache

  RETURN
    >= 0 	File handle
   -1		Error
*/


static File create_file(THD *thd, char *path, sql_exchange *exchange,
			IO_CACHE *cache)
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{
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  File file;
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  uint option= MY_UNPACK_FILENAME | MY_RELATIVE_PATH;
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#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
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  option|= MY_REPLACE_DIR;			// Force use of db directory
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#endif
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  if (!dirname_length(exchange->file_name))
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  {
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    strxnmov(path, FN_REFLEN-1, mysql_real_data_home, thd->db ? thd->db : "",
             NullS);
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    (void) fn_format(path, exchange->file_name, path, "", option);
  }
  else
    (void) fn_format(path, exchange->file_name, mysql_real_data_home, "", option);
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  if (!is_secure_file_path(path))
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  {
    /* Write only allowed to dir or subdir specified by secure_file_priv */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
    return -1;
  }

2269
  if (!access(path, F_OK))
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  {
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    my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name);
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    return -1;
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  }
  /* Create the file world readable */
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  if ((file= mysql_file_create(key_select_to_file,
                               path, 0666, O_WRONLY|O_EXCL, MYF(MY_WME))) < 0)
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    return file;
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#ifdef HAVE_FCHMOD
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  (void) fchmod(file, 0666);			// Because of umask()
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#else
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  (void) chmod(path, 0666);
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#endif
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  if (init_io_cache(cache, file, 0L, WRITE_CACHE, 0L, 1, MYF(MY_WME)))
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  {
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    mysql_file_close(file, MYF(0));
    /* Delete file on error, it was just created */
    mysql_file_delete(key_select_to_file, path, MYF(0));
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    return -1;
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  }
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  return file;
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}


int
select_export::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
  bool blob_flag=0;
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  bool string_results= FALSE, non_string_results= FALSE;
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  unit= u;
  if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
    strmake(path,exchange->file_name,FN_REFLEN-1);

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  write_cs= exchange->cs ? exchange->cs : &my_charset_bin;

2305
  if ((file= create_file(thd, path, exchange, &cache)) < 0)
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    return 1;
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  /* Check if there is any blobs in data */
  {
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    List_iterator_fast<Item> li(list);
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    Item *item;
    while ((item=li++))
    {
      if (item->max_length >= MAX_BLOB_WIDTH)
      {
	blob_flag=1;
	break;
      }
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      if (item->result_type() == STRING_RESULT)
        string_results= TRUE;
      else
        non_string_results= TRUE;
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    }
  }
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  if (exchange->escaped->numchars() > 1 || exchange->enclosed->numchars() > 1)
  {
    my_error(ER_WRONG_FIELD_TERMINATORS, MYF(0));
    return TRUE;
  }
  if (exchange->escaped->length() > 1 || exchange->enclosed->length() > 1 ||
      !my_isascii(exchange->escaped->ptr()[0]) ||
      !my_isascii(exchange->enclosed->ptr()[0]) ||
      !exchange->field_term->is_ascii() || !exchange->line_term->is_ascii() ||
      !exchange->line_start->is_ascii())
  {
    /*
      Current LOAD DATA INFILE recognizes field/line separators "as is" without
      converting from client charset to data file charset. So, it is supposed,
      that input file of LOAD DATA INFILE consists of data in one charset and
      separators in other charset. For the compatibility with that [buggy]
      behaviour SELECT INTO OUTFILE implementation has been saved "as is" too,
      but the new warning message has been added:

        Non-ASCII separator arguments are not fully supported
    */
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED,
                 ER(WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED));
  }
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  field_term_length=exchange->field_term->length();
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  field_term_char= field_term_length ?
                   (int) (uchar) (*exchange->field_term)[0] : INT_MAX;
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  if (!exchange->line_term->length())
    exchange->line_term=exchange->field_term;	// Use this if it exists
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  field_sep_char= (exchange->enclosed->length() ?
                  (int) (uchar) (*exchange->enclosed)[0] : field_term_char);
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  if (exchange->escaped->length() && (exchange->escaped_given() ||
      !(thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)))
    escape_char= (int) (uchar) (*exchange->escaped)[0];
  else
    escape_char= -1;
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  is_ambiguous_field_sep= test(strchr(ESCAPE_CHARS, field_sep_char));
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  is_unsafe_field_sep= test(strchr(NUMERIC_CHARS, field_sep_char));
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  line_sep_char= (exchange->line_term->length() ?
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                 (int) (uchar) (*exchange->line_term)[0] : INT_MAX);
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  if (!field_term_length)
    exchange->opt_enclosed=0;
  if (!exchange->enclosed->length())
    exchange->opt_enclosed=1;			// A little quicker loop
  fixed_row_size= (!field_term_length && !exchange->enclosed->length() &&
		   !blob_flag);
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  if ((is_ambiguous_field_sep && exchange->enclosed->is_empty() &&
       (string_results || is_unsafe_field_sep)) ||
      (exchange->opt_enclosed && non_string_results &&
       field_term_length && strchr(NUMERIC_CHARS, field_term_char)))
  {
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_AMBIGUOUS_FIELD_TERM, ER(ER_AMBIGUOUS_FIELD_TERM));
    is_ambiguous_field_term= TRUE;
  }
  else
    is_ambiguous_field_term= FALSE;

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  return 0;
}


2387
#define NEED_ESCAPING(x) ((int) (uchar) (x) == escape_char    || \
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                          (enclosed ? (int) (uchar) (x) == field_sep_char      \
                                    : (int) (uchar) (x) == field_term_char) || \
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                          (int) (uchar) (x) == line_sep_char  || \
                          !(x))

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bool select_export::send_data(List<Item> &items)
{

2396
  DBUG_ENTER("select_export::send_data");
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  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
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  char cvt_buff[MAX_FIELD_WIDTH];
  String cvt_str(cvt_buff, sizeof(cvt_buff), write_cs);
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  bool space_inited=0;
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  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
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  tmp.length(0);

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  if (unit->offset_limit_cnt)
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  {						// using limit offset,count
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    unit->offset_limit_cnt--;
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    DBUG_RETURN(0);
  }
  row_count++;
  Item *item;
  uint used_length=0,items_left=items.elements;
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  List_iterator_fast<Item> li(items);
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2414
  if (my_b_write(&cache,(uchar*) exchange->line_start->ptr(),
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		 exchange->line_start->length()))
    goto err;
  while ((item=li++))
  {
    Item_result result_type=item->result_type();
2420 2421
    bool enclosed = (exchange->enclosed->length() &&
                     (!exchange->opt_enclosed || result_type == STRING_RESULT));
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    res=item->str_result(&tmp);
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    if (res && !my_charset_same(write_cs, res->charset()) &&
        !my_charset_same(write_cs, &my_charset_bin))
    {
      const char *well_formed_error_pos;
      const char *cannot_convert_error_pos;
      const char *from_end_pos;
      const char *error_pos;
      uint32 bytes;
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
      uint64 estimated_bytes=
        ((uint64) res->length() / res->charset()->mbminlen + 1) *
        write_cs->mbmaxlen + 1;
      set_if_smaller(estimated_bytes, UINT_MAX32);
      if (cvt_str.realloc((uint32) estimated_bytes))
      {
        my_error(ER_OUTOFMEMORY, MYF(0), (uint32) estimated_bytes);
        goto err;
      }

      bytes= well_formed_copy_nchars(write_cs, (char *) cvt_str.ptr(),
                                     cvt_str.alloced_length(),
2443
                                     res->charset(), res->ptr(), res->length(),
2444 2445
                                     UINT_MAX32, // copy all input chars,
                                                 // i.e. ignore nchars parameter
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                                     &well_formed_error_pos,
                                     &cannot_convert_error_pos,
                                     &from_end_pos);
      error_pos= well_formed_error_pos ? well_formed_error_pos
                                       : cannot_convert_error_pos;
      if (error_pos)
      {
        char printable_buff[32];
        convert_to_printable(printable_buff, sizeof(printable_buff),
                             error_pos, res->ptr() + res->length() - error_pos,
                             res->charset(), 6);
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_TRUNCATED_WRONG_VALUE_FOR_FIELD,
                            ER(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD),
                            "string", printable_buff,
2461
                            item->name, static_cast<long>(row_count));
2462
      }
2463 2464 2465 2466 2467 2468 2469
      else if (from_end_pos < res->ptr() + res->length())
      { 
        /*
          result is longer than UINT_MAX32 and doesn't fit into String
        */
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_DATA_TRUNCATED, ER(WARN_DATA_TRUNCATED),
2470
                            item->full_name(), static_cast<long>(row_count));
2471
      }
2472 2473 2474
      cvt_str.length(bytes);
      res= &cvt_str;
    }
2475
    if (res && enclosed)
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    {
2477
      if (my_b_write(&cache,(uchar*) exchange->enclosed->ptr(),
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		     exchange->enclosed->length()))
	goto err;
    }
    if (!res)
    {						// NULL
      if (!fixed_row_size)
      {
	if (escape_char != -1)			// Use \N syntax
	{
	  null_buff[0]=escape_char;
	  null_buff[1]='N';
2489
	  if (my_b_write(&cache,(uchar*) null_buff,2))
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	    goto err;
	}
2492
	else if (my_b_write(&cache,(uchar*) "NULL",4))
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	  goto err;
      }
      else
      {
	used_length=0;				// Fill with space
      }
    }
    else
    {
      if (fixed_row_size)
	used_length=min(res->length(),item->max_length);
      else
	used_length=res->length();
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      if ((result_type == STRING_RESULT || is_unsafe_field_sep) &&
           escape_char != -1)
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      {
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        char *pos, *start, *end;
        CHARSET_INFO *res_charset= res->charset();
        CHARSET_INFO *character_set_client= thd->variables.
                                            character_set_client;
        bool check_second_byte= (res_charset == &my_charset_bin) &&
                                 character_set_client->
                                 escape_with_backslash_is_dangerous;
        DBUG_ASSERT(character_set_client->mbmaxlen == 2 ||
                    !character_set_client->escape_with_backslash_is_dangerous);
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	for (start=pos=(char*) res->ptr(),end=pos+used_length ;
	     pos != end ;
	     pos++)
	{
#ifdef USE_MB
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	  if (use_mb(res_charset))
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	  {
	    int l;
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	    if ((l=my_ismbchar(res_charset, pos, end)))
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	    {
	      pos += l-1;
	      continue;
	    }
	  }
#endif
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          /*
            Special case when dumping BINARY/VARBINARY/BLOB values
            for the clients with character sets big5, cp932, gbk and sjis,
            which can have the escape character (0x5C "\" by default)
            as the second byte of a multi-byte sequence.
            
            If
            - pos[0] is a valid multi-byte head (e.g 0xEE) and
            - pos[1] is 0x00, which will be escaped as "\0",
            
            then we'll get "0xEE + 0x5C + 0x30" in the output file.
            
            If this file is later loaded using this sequence of commands:
            
            mysql> create table t1 (a varchar(128)) character set big5;
            mysql> LOAD DATA INFILE 'dump.txt' INTO TABLE t1;
            
            then 0x5C will be misinterpreted as the second byte
            of a multi-byte character "0xEE + 0x5C", instead of
            escape character for 0x00.
            
            To avoid this confusion, we'll escape the multi-byte
            head character too, so the sequence "0xEE + 0x00" will be
            dumped as "0x5C + 0xEE + 0x5C + 0x30".
            
            Note, in the condition below we only check if
            mbcharlen is equal to 2, because there are no
            character sets with mbmaxlen longer than 2
            and with escape_with_backslash_is_dangerous set.
            DBUG_ASSERT before the loop makes that sure.
          */

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          if ((NEED_ESCAPING(*pos) ||
               (check_second_byte &&
                my_mbcharlen(character_set_client, (uchar) *pos) == 2 &&
                pos + 1 < end &&
                NEED_ESCAPING(pos[1]))) &&
              /*
               Don't escape field_term_char by doubling - doubling is only
               valid for ENCLOSED BY characters:
              */
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              (enclosed || !is_ambiguous_field_term ||
               (int) (uchar) *pos != field_term_char))
2577
          {
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	    char tmp_buff[2];
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            tmp_buff[0]= ((int) (uchar) *pos == field_sep_char &&
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                          is_ambiguous_field_sep) ?
                          field_sep_char : escape_char;
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	    tmp_buff[1]= *pos ? *pos : '0';
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	    if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)) ||
		my_b_write(&cache,(uchar*) tmp_buff,2))
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	      goto err;
	    start=pos+1;
	  }
	}
2589
	if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)))
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	  goto err;
      }
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      else if (my_b_write(&cache,(uchar*) res->ptr(),used_length))
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	goto err;
    }
    if (fixed_row_size)
    {						// Fill with space
      if (item->max_length > used_length)
      {
	/* QQ:  Fix by adding a my_b_fill() function */
	if (!space_inited)
	{
	  space_inited=1;
	  bfill(space,sizeof(space),' ');
	}
	uint length=item->max_length-used_length;
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	for (; length > sizeof(space) ; length-=sizeof(space))
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	{
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	  if (my_b_write(&cache,(uchar*) space,sizeof(space)))
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	    goto err;
	}
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	if (my_b_write(&cache,(uchar*) space,length))
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	  goto err;
      }
    }
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    if (res && enclosed)
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    {
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      if (my_b_write(&cache, (uchar*) exchange->enclosed->ptr(),
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                     exchange->enclosed->length()))
        goto err;
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    }
    if (--items_left)
    {
2623
      if (my_b_write(&cache, (uchar*) exchange->field_term->ptr(),
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                     field_term_length))
        goto err;
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    }
  }
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  if (my_b_write(&cache,(uchar*) exchange->line_term->ptr(),
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		 exchange->line_term->length()))
    goto err;
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


/***************************************************************************
** Dump  of select to a binary file
***************************************************************************/


int
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select_dump::prepare(List<Item> &list __attribute__((unused)),
		     SELECT_LEX_UNIT *u)
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{
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  unit= u;
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  return (int) ((file= create_file(thd, path, exchange, &cache)) < 0);
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}


bool select_dump::send_data(List<Item> &items)
{
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  List_iterator_fast<Item> li(items);
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  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
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  tmp.length(0);
  Item *item;
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  DBUG_ENTER("select_dump::send_data");
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2660
  if (unit->offset_limit_cnt)
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  {						// using limit offset,count
2662
    unit->offset_limit_cnt--;
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    DBUG_RETURN(0);
  }
  if (row_count++ > 1) 
  {
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    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
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    goto err;
  }
  while ((item=li++))
  {
    res=item->str_result(&tmp);
2673
    if (!res)					// If NULL
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    {
2675
      if (my_b_write(&cache,(uchar*) "",1))
2676
	goto err;
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    }
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    else if (my_b_write(&cache,(uchar*) res->ptr(),res->length()))
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    {
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      my_error(ER_ERROR_ON_WRITE, MYF(0), path, my_errno);
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      goto err;
    }
  }
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


2690
select_subselect::select_subselect(Item_subselect *item_arg)
2691
{
2692
  item= item_arg;
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}

2695

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bool select_singlerow_subselect::send_data(List<Item> &items)
2697
{
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  DBUG_ENTER("select_singlerow_subselect::send_data");
  Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
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  if (it->assigned())
  {
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    my_message(ER_SUBQUERY_NO_1_ROW, ER(ER_SUBQUERY_NO_1_ROW), MYF(0));
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    DBUG_RETURN(1);
  }
  if (unit->offset_limit_cnt)
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  {				          // Using limit offset,count
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    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
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  }
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  List_iterator_fast<Item> li(items);
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  Item *val_item;
  for (uint i= 0; (val_item= li++); i++)
    it->store(i, val_item);
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  it->assigned(1);
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  DBUG_RETURN(0);
2716
}
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2718

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void select_max_min_finder_subselect::cleanup()
{
  DBUG_ENTER("select_max_min_finder_subselect::cleanup");
  cache= 0;
  DBUG_VOID_RETURN;
}


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bool select_max_min_finder_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_max_min_finder_subselect::send_data");
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  Item_maxmin_subselect *it= (Item_maxmin_subselect *)item;
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  List_iterator_fast<Item> li(items);
  Item *val_item= li++;
2733
  it->register_value();
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  if (it->assigned())
  {
    cache->store(val_item);
    if ((this->*op)())
      it->store(0, cache);
  }
  else
  {
    if (!cache)
    {
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      cache= Item_cache::get_cache(val_item);
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      switch (val_item->result_type())
      {
      case REAL_RESULT:
	op= &select_max_min_finder_subselect::cmp_real;
	break;
      case INT_RESULT:
	op= &select_max_min_finder_subselect::cmp_int;
	break;
      case STRING_RESULT:
	op= &select_max_min_finder_subselect::cmp_str;
	break;
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      case DECIMAL_RESULT:
        op= &select_max_min_finder_subselect::cmp_decimal;
        break;
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      case ROW_RESULT:
        // This case should never be choosen
	DBUG_ASSERT(0);
	op= 0;
      }
    }
    cache->store(val_item);
    it->store(0, cache);
  }
  it->assigned(1);
  DBUG_RETURN(0);
}

bool select_max_min_finder_subselect::cmp_real()
{
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  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
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  double val1= cache->val_real(), val2= maxmin->val_real();
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  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
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  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
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}

bool select_max_min_finder_subselect::cmp_int()
{
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  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
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  longlong val1= cache->val_int(), val2= maxmin->val_int();
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
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  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
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}

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bool select_max_min_finder_subselect::cmp_decimal()
{
2800
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
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  my_decimal cval, *cvalue= cache->val_decimal(&cval);
  my_decimal mval, *mvalue= maxmin->val_decimal(&mval);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       my_decimal_cmp(cvalue, mvalue) > 0) ;
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  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     my_decimal_cmp(cvalue,mvalue) < 0);
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}

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bool select_max_min_finder_subselect::cmp_str()
{
  String *val1, *val2, buf1, buf2;
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  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
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  /*
    as far as both operand is Item_cache buf1 & buf2 will not be used,
    but added for safety
  */
  val1= cache->val_str(&buf1);
  val2= maxmin->val_str(&buf1);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       sortcmp(val1, val2, cache->collation.collation) > 0) ;
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  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     sortcmp(val1, val2, cache->collation.collation) < 0);
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}

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bool select_exists_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_exists_subselect::send_data");
  Item_exists_subselect *it= (Item_exists_subselect *)item;
  if (unit->offset_limit_cnt)
  {				          // Using limit offset,count
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
  it->value= 1;
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  it->assigned(1);
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  DBUG_RETURN(0);
}

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/***************************************************************************
2847
  Dump of select to variables
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***************************************************************************/
2849

2850
int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
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{
2852
  unit= u;
2853
  
2854
  if (var_list.elements != list.elements)
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  {
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    my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
               ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT), MYF(0));
2858
    return 1;
2859
  }               
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  return 0;
}
2862

2863

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bool select_dumpvar::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_SELECT, MYF(0));
  return TRUE;
}


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void select_dumpvar::cleanup()
{
2873
  row_count= 0;
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}


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Query_arena::Type Query_arena::type() const
2878
{
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  DBUG_ASSERT(0); /* Should never be called */
2880
  return STATEMENT;
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}


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void Query_arena::free_items()
{
  Item *next;
  DBUG_ENTER("Query_arena::free_items");
  /* This works because items are allocated with sql_alloc() */
  for (; free_list; free_list= next)
  {
    next= free_list->next;
    free_list->delete_self();
  }
  /* Postcondition: free_list is 0 */
  DBUG_VOID_RETURN;
}


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void Query_arena::set_query_arena(Query_arena *set)
{
  mem_root=  set->mem_root;
  free_list= set->free_list;
  state= set->state;
}


void Query_arena::cleanup_stmt()
{
2909
  DBUG_ASSERT(! "Query_arena::cleanup_stmt() not implemented");
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}

2912
/*
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  Statement functions
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*/

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Statement::Statement(LEX *lex_arg, MEM_ROOT *mem_root_arg,
                     enum enum_state state_arg, ulong id_arg)
  :Query_arena(mem_root_arg, state_arg),
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  id(id_arg),
2920
  mark_used_columns(MARK_COLUMNS_READ),
2921
  lex(lex_arg),
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  db(NULL),
  db_length(0)
2924
{
2925
  name.str= NULL;
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}


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Query_arena::Type Statement::type() const
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{
  return STATEMENT;
}


void Statement::set_statement(Statement *stmt)
{
  id=             stmt->id;
2938
  mark_used_columns=   stmt->mark_used_columns;
2939
  lex=            stmt->lex;
2940
  query_string=   stmt->query_string;
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}


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void
Statement::set_n_backup_statement(Statement *stmt, Statement *backup)
{
2947
  DBUG_ENTER("Statement::set_n_backup_statement");
2948 2949
  backup->set_statement(this);
  set_statement(stmt);
2950
  DBUG_VOID_RETURN;
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}


void Statement::restore_backup_statement(Statement *stmt, Statement *backup)
{
2956
  DBUG_ENTER("Statement::restore_backup_statement");
2957 2958
  stmt->set_statement(this);
  set_statement(backup);
2959
  DBUG_VOID_RETURN;
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}


2963
void THD::end_statement()
2964
{
2965
  /* Cleanup SQL processing state to reuse this statement in next query. */
2966 2967 2968
  lex_end(lex);
  delete lex->result;
  lex->result= 0;
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  /* Note that free_list is freed in cleanup_after_query() */

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  /*
    Don't free mem_root, as mem_root is freed in the end of dispatch_command
    (once for any command).
  */
}


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void THD::set_n_backup_active_arena(Query_arena *set, Query_arena *backup)
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{
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  DBUG_ENTER("THD::set_n_backup_active_arena");
2981
  DBUG_ASSERT(backup->is_backup_arena == FALSE);
2982

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2983 2984
  backup->set_query_arena(this);
  set_query_arena(set);
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2985
#ifndef DBUG_OFF
2986
  backup->is_backup_arena= TRUE;
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#endif
2988
  DBUG_VOID_RETURN;
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}


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void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
2993
{
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  DBUG_ENTER("THD::restore_active_arena");
2995
  DBUG_ASSERT(backup->is_backup_arena);
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  set->set_query_arena(this);
  set_query_arena(backup);
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#ifndef DBUG_OFF
2999
  backup->is_backup_arena= FALSE;
3000
#endif
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  DBUG_VOID_RETURN;
3002 3003
}

3004 3005 3006 3007 3008 3009
Statement::~Statement()
{
}

C_MODE_START

3010 3011
static uchar *
get_statement_id_as_hash_key(const uchar *record, size_t *key_length,
3012 3013 3014 3015
                             my_bool not_used __attribute__((unused)))
{
  const Statement *statement= (const Statement *) record; 
  *key_length= sizeof(statement->id);
3016
  return (uchar *) &((const Statement *) statement)->id;
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}

static void delete_statement_as_hash_key(void *key)
{
  delete (Statement *) key;
}

3024
static uchar *get_stmt_name_hash_key(Statement *entry, size_t *length,
3025
                                    my_bool not_used __attribute__((unused)))
3026
{
3027 3028
  *length= entry->name.length;
  return (uchar*) entry->name.str;
3029 3030
}

3031 3032 3033 3034 3035
C_MODE_END

Statement_map::Statement_map() :
  last_found_statement(0)
{
3036 3037 3038 3039 3040
  enum
  {
    START_STMT_HASH_SIZE = 16,
    START_NAME_HASH_SIZE = 16
  };
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  my_hash_init(&st_hash, &my_charset_bin, START_STMT_HASH_SIZE, 0, 0,
               get_statement_id_as_hash_key,
               delete_statement_as_hash_key, MYF(0));
  my_hash_init(&names_hash, system_charset_info, START_NAME_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_stmt_name_hash_key,
               NULL,MYF(0));
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}

3049

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/*
  Insert a new statement to the thread-local statement map.

  DESCRIPTION
    If there was an old statement with the same name, replace it with the
    new one. Otherwise, check if max_prepared_stmt_count is not reached yet,
    increase prepared_stmt_count, and insert the new statement. It's okay
    to delete an old statement and fail to insert the new one.

  POSTCONDITIONS
    All named prepared statements are also present in names_hash.
    Statement names in names_hash are unique.
    The statement is added only if prepared_stmt_count < max_prepard_stmt_count
    last_found_statement always points to a valid statement or is 0

  RETURN VALUE
    0  success
    1  error: out of resources or max_prepared_stmt_count limit has been
       reached. An error is sent to the client, the statement is deleted.
*/

int Statement_map::insert(THD *thd, Statement *statement)
3072
{
3073
  if (my_hash_insert(&st_hash, (uchar*) statement))
3074
  {
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    /*
      Delete is needed only in case of an insert failure. In all other
      cases hash_delete will also delete the statement.
    */
    delete statement;
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_st_hash;
  }
3083
  if (statement->name.str && my_hash_insert(&names_hash, (uchar*) statement))
3084
  {
3085 3086
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_names_hash;
3087
  }
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3088
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
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  /*
    We don't check that prepared_stmt_count is <= max_prepared_stmt_count
    because we would like to allow to lower the total limit
    of prepared statements below the current count. In that case
    no new statements can be added until prepared_stmt_count drops below
    the limit.
  */
  if (prepared_stmt_count >= max_prepared_stmt_count)
  {
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3098
    mysql_mutex_unlock(&LOCK_prepared_stmt_count);
3099 3100
    my_error(ER_MAX_PREPARED_STMT_COUNT_REACHED, MYF(0),
             max_prepared_stmt_count);
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    goto err_max;
  }
  prepared_stmt_count++;
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3104
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
3105

3106
  last_found_statement= statement;
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  return 0;

err_max:
  if (statement->name.str)
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3111
    my_hash_delete(&names_hash, (uchar*) statement);
3112
err_names_hash:
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3113
  my_hash_delete(&st_hash, (uchar*) statement);
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err_st_hash:
  return 1;
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}

3118

3119 3120
void Statement_map::close_transient_cursors()
{
3121
#ifdef TO_BE_IMPLEMENTED
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  Statement *stmt;
  while ((stmt= transient_cursor_list.head()))
    stmt->close_cursor();                 /* deletes itself from the list */
3125
#endif
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}


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void Statement_map::erase(Statement *statement)
{
  if (statement == last_found_statement)
    last_found_statement= 0;
  if (statement->name.str)
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3134
    my_hash_delete(&names_hash, (uchar *) statement);
3135

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3136
  my_hash_delete(&st_hash, (uchar *) statement);
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3137
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
3138 3139
  DBUG_ASSERT(prepared_stmt_count > 0);
  prepared_stmt_count--;
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3140
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
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}


void Statement_map::reset()
{
  /* Must be first, hash_free will reset st_hash.records */
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3147
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
3148 3149
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
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3150
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
3151 3152 3153 3154

  my_hash_reset(&names_hash);
  my_hash_reset(&st_hash);
  last_found_statement= 0;
3155 3156
}

3157

3158 3159 3160
Statement_map::~Statement_map()
{
  /* Must go first, hash_free will reset st_hash.records */
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3161
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
3162 3163
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
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3164
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
3165

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  my_hash_free(&names_hash);
  my_hash_free(&st_hash);
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}

3170 3171
bool select_dumpvar::send_data(List<Item> &items)
{
3172
  List_iterator_fast<my_var> var_li(var_list);
3173
  List_iterator<Item> it(items);
3174
  Item *item;
3175
  my_var *mv;
3176
  DBUG_ENTER("select_dumpvar::send_data");
3177

3178
  if (unit->offset_limit_cnt)
3179
  {						// using limit offset,count
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    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
3183 3184
  if (row_count++) 
  {
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3185
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
3186 3187
    DBUG_RETURN(1);
  }
3188
  while ((mv= var_li++) && (item= it++))
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3189
  {
3190
    if (mv->local)
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3191
    {
3192 3193
      if (thd->spcont->set_variable(thd, mv->offset, &item))
	    DBUG_RETURN(1);
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    }
    else
    {
3197
      Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
3198 3199
      if (suv->fix_fields(thd, 0))
        DBUG_RETURN (1);
3200
      suv->save_item_result(item);
3201 3202
      if (suv->update())
        DBUG_RETURN (1);
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3203
    }
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3204
  }
3205
  DBUG_RETURN(thd->is_error());
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}

bool select_dumpvar::send_eof()
{
3210
  if (! row_count)
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_SP_FETCH_NO_DATA, ER(ER_SP_FETCH_NO_DATA));
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  /*
    Don't send EOF if we're in error condition (which implies we've already
    sent or are sending an error)
  */
  if (thd->is_error())
    return true;

3220
  ::my_ok(thd,row_count);
3221
  return 0;
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3222
}
3223 3224 3225 3226 3227 3228 3229

/****************************************************************************
  TMP_TABLE_PARAM
****************************************************************************/

void TMP_TABLE_PARAM::init()
{
3230 3231
  DBUG_ENTER("TMP_TABLE_PARAM::init");
  DBUG_PRINT("enter", ("this: 0x%lx", (ulong)this));
3232 3233 3234
  field_count= sum_func_count= func_count= hidden_field_count= 0;
  group_parts= group_length= group_null_parts= 0;
  quick_group= 1;
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3235
  table_charset= 0;
3236
  precomputed_group_by= 0;
3237
  DBUG_VOID_RETURN;
3238
}
3239 3240 3241 3242


void thd_increment_bytes_sent(ulong length)
{
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3243
  THD *thd=current_thd;
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3244
  if (likely(thd != 0))
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  { /* current_thd==0 when close_connection() calls net_send_error() */
    thd->status_var.bytes_sent+= length;
  }
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}


void thd_increment_bytes_received(ulong length)
{
  current_thd->status_var.bytes_received+= length;
}


void thd_increment_net_big_packet_count(ulong length)
{
  current_thd->status_var.net_big_packet_count+= length;
}


void THD::set_status_var_init()
{
  bzero((char*) &status_var, sizeof(status_var));
}
3267

3268

3269
void Security_context::init()
3270
{
3271
  host= user= ip= external_user= 0;
3272
  host_or_ip= "connecting host";
3273
  priv_user[0]= priv_host[0]= proxy_user[0]= '\0';
3274
  master_access= 0;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  db_access= NO_ACCESS;
#endif
}


3281
void Security_context::destroy()
3282 3283 3284
{
  // If not pointer to constant
  if (host != my_localhost)
3285 3286 3287 3288
  {
    my_free(host);
    host= NULL;
  }
3289
  if (user != delayed_user)
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  {
    my_free(user);
    user= NULL;
  }

3295 3296 3297 3298 3299 3300
  if (external_user)
  {
    my_free(external_user);
    user= NULL;
  }

3301 3302
  my_free(ip);
  ip= NULL;
3303 3304 3305
}


3306
void Security_context::skip_grants()
3307 3308 3309 3310
{
  /* privileges for the user are unknown everything is allowed */
  host_or_ip= (char *)"";
  master_access= ~NO_ACCESS;
3311
  *priv_user= *priv_host= '\0';
3312 3313 3314
}


3315 3316
bool Security_context::set_user(char *user_arg)
{
3317
  my_free(user);
3318 3319 3320 3321
  user= my_strdup(user_arg, MYF(0));
  return user == 0;
}

3322 3323 3324 3325 3326
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
  Initialize this security context from the passed in credentials
  and activate it in the current thread.

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3327 3328 3329 3330
  @param       thd
  @param       definer_user
  @param       definer_host
  @param       db
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  @param[out]  backup  Save a pointer to the current security context
                       in the thread. In case of success it points to the
                       saved old context, otherwise it points to NULL.


  During execution of a statement, multiple security contexts may
  be needed:
  - the security context of the authenticated user, used as the
    default security context for all top-level statements
  - in case of a view or a stored program, possibly the security
    context of the definer of the routine, if the object is
    defined with SQL SECURITY DEFINER option.

  The currently "active" security context is parameterized in THD
  member security_ctx. By default, after a connection is
  established, this member points at the "main" security context
  - the credentials of the authenticated user.

  Later, if we would like to execute some sub-statement or a part
  of a statement under credentials of a different user, e.g.
  definer of a procedure, we authenticate this user in a local
  instance of Security_context by means of this method (and
3353
  ultimately by means of acl_getroot), and make the
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  local instance active in the thread by re-setting
  thd->security_ctx pointer.

  Note, that the life cycle and memory management of the "main" and
  temporary security contexts are different.
  For the main security context, the memory for user/host/ip is
  allocated on system heap, and the THD class frees this memory in
  its destructor. The only case when contents of the main security
  context may change during its life time is when someone issued
  CHANGE USER command.
  Memory management of a "temporary" security context is
  responsibility of the module that creates it.

  @retval TRUE  there is no user with the given credentials. The erro
                is reported in the thread.
  @retval FALSE success
*/

bool
Security_context::
change_security_context(THD *thd,
                        LEX_STRING *definer_user,
                        LEX_STRING *definer_host,
                        LEX_STRING *db,
                        Security_context **backup)
{
  bool needs_change;

  DBUG_ENTER("Security_context::change_security_context");

  DBUG_ASSERT(definer_user->str && definer_host->str);

  *backup= NULL;
3387
  needs_change= (strcmp(definer_user->str, thd->security_ctx->priv_user) ||
3388 3389 3390 3391
                 my_strcasecmp(system_charset_info, definer_host->str,
                               thd->security_ctx->priv_host));
  if (needs_change)
  {
3392
    if (acl_getroot(this, definer_user->str, definer_host->str,
3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414
                                definer_host->str, db->str))
    {
      my_error(ER_NO_SUCH_USER, MYF(0), definer_user->str,
               definer_host->str);
      DBUG_RETURN(TRUE);
    }
    *backup= thd->security_ctx;
    thd->security_ctx= this;
  }

  DBUG_RETURN(FALSE);
}


void
Security_context::restore_security_context(THD *thd,
                                           Security_context *backup)
{
  if (backup)
    thd->security_ctx= backup;
}
#endif
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3415

3416

3417 3418 3419 3420 3421 3422 3423
bool Security_context::user_matches(Security_context *them)
{
  return ((user != NULL) && (them->user != NULL) &&
          !strcmp(user, them->user));
}


3424 3425 3426 3427 3428 3429 3430 3431
/****************************************************************************
  Handling of open and locked tables states.

  This is used when we want to open/lock (and then close) some tables when
  we already have a set of tables open and locked. We use these methods for
  access to mysql.proc table to find definitions of stored routines.
****************************************************************************/

3432
void THD::reset_n_backup_open_tables_state(Open_tables_backup *backup)
3433
{
3434 3435
  DBUG_ENTER("reset_n_backup_open_tables_state");
  backup->set_open_tables_state(this);
3436
  backup->mdl_system_tables_svp= mdl_context.mdl_savepoint();
3437
  reset_open_tables_state(this);
3438
  state_flags|= Open_tables_state::BACKUPS_AVAIL;
3439
  DBUG_VOID_RETURN;
3440 3441 3442
}


3443
void THD::restore_backup_open_tables_state(Open_tables_backup *backup)
3444 3445
{
  DBUG_ENTER("restore_backup_open_tables_state");
3446
  mdl_context.rollback_to_savepoint(backup->mdl_system_tables_svp);
3447 3448 3449 3450 3451
  /*
    Before we will throw away current open tables state we want
    to be sure that it was properly cleaned up.
  */
  DBUG_ASSERT(open_tables == 0 && temporary_tables == 0 &&
3452
              derived_tables == 0 &&
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Konstantin Osipov committed
3453 3454
              lock == 0 &&
              locked_tables_mode == LTM_NONE &&
3455
              m_reprepare_observer == NULL);
3456

3457
  set_open_tables_state(backup);
3458 3459
  DBUG_VOID_RETURN;
}
3460

3461 3462 3463 3464 3465 3466 3467 3468 3469 3470
/**
  Check the killed state of a user thread
  @param thd  user thread
  @retval 0 the user thread is active
  @retval 1 the user thread has been killed
*/
extern "C" int thd_killed(const MYSQL_THD thd)
{
  return(thd->killed);
}
3471

3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482
/**
  Return the thread id of a user thread
  @param thd user thread
  @return thread id
*/
extern "C" unsigned long thd_get_thread_id(const MYSQL_THD thd)
{
  return((unsigned long)thd->thread_id);
}


3483 3484 3485 3486 3487 3488
#ifdef INNODB_COMPATIBILITY_HOOKS
extern "C" struct charset_info_st *thd_charset(MYSQL_THD thd)
{
  return(thd->charset());
}

3489 3490 3491 3492
/**
  OBSOLETE : there's no way to ensure the string is null terminated.
  Use thd_query_string instead()
*/
3493 3494
extern "C" char **thd_query(MYSQL_THD thd)
{
3495
  return (&thd->query_string.string.str);
3496 3497 3498 3499 3500 3501 3502 3503 3504 3505
}

/**
  Get the current query string for the thread.

  @param The MySQL internal thread pointer
  @return query string and length. May be non-null-terminated.
*/
extern "C" LEX_STRING * thd_query_string (MYSQL_THD thd)
{
3506
  return(&thd->query_string.string);
3507 3508 3509 3510 3511 3512
}

extern "C" int thd_slave_thread(const MYSQL_THD thd)
{
  return(thd->slave_thread);
}
3513

3514 3515
extern "C" int thd_non_transactional_update(const MYSQL_THD thd)
{
3516
  return(thd->transaction.all.modified_non_trans_table);
3517 3518
}

3519
extern "C" int thd_binlog_format(const MYSQL_THD thd)
3520
{
3521
  if (mysql_bin_log.is_open() && (thd->variables.option_bits & OPTION_BIN_LOG))
3522 3523 3524
    return (int) thd->variables.binlog_format;
  else
    return BINLOG_FORMAT_UNSPEC;
3525
}
3526 3527 3528 3529 3530

extern "C" void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all)
{
  mark_transaction_to_rollback(thd, all);
}
3531 3532 3533 3534 3535

extern "C" bool thd_binlog_filter_ok(const MYSQL_THD thd)
{
  return binlog_filter->db_ok(thd->db);
}
3536 3537 3538 3539 3540

extern "C" bool thd_sqlcom_can_generate_row_events(const MYSQL_THD thd)
{
  return sqlcom_can_generate_row_events(thd);
}
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3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566
#ifndef EMBEDDED_LIBRARY
extern "C" void thd_pool_wait_begin(MYSQL_THD thd, int wait_type);
extern "C" void thd_pool_wait_end(MYSQL_THD thd);

/*
  Interface for MySQL Server, plugins and storage engines to report
  when they are going to sleep/stall.
  
  SYNOPSIS
  thd_wait_begin()
  thd                     Thread object
  wait_type               Type of wait
                          1 -- short wait (e.g. for mutex)
                          2 -- medium wait (e.g. for disk io)
                          3 -- large wait (e.g. for locked row/table)
  NOTES
    This is used by the threadpool to have better knowledge of which
    threads that currently are actively running on CPUs. When a thread
    reports that it's going to sleep/stall, the threadpool scheduler is
    free to start another thread in the pool most likely. The expected wait
    time is simply an indication of how long the wait is expected to
    become, the real wait time could be very different.

  thd_wait_end MUST be called immediately after waking up again.
*/
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3567
extern "C" void thd_wait_begin(MYSQL_THD thd, int wait_type)
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{
  MYSQL_CALLBACK(thread_scheduler, thd_wait_begin, (thd, wait_type));
}

/**
  Interface for MySQL Server, plugins and storage engines to report
  when they waking up from a sleep/stall.

  @param  thd   Thread handle
*/
extern "C" void thd_wait_end(MYSQL_THD thd)
{
  MYSQL_CALLBACK(thread_scheduler, thd_wait_end, (thd));
}
#else
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3583
extern "C" void thd_wait_begin(MYSQL_THD thd, int wait_type)
3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594
{
  /* do NOTHING for the embedded library */
  return;
}

extern "C" void thd_wait_end(MYSQL_THD thd)
{
  /* do NOTHING for the embedded library */
  return;
}
#endif
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#endif // INNODB_COMPATIBILITY_HOOKS */
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/****************************************************************************
  Handling of statement states in functions and triggers.

  This is used to ensure that the function/trigger gets a clean state
  to work with and does not cause any side effects of the calling statement.

  It also allows most stored functions and triggers to replicate even
  if they are used items that would normally be stored in the binary
  replication (like last_insert_id() etc...)

  The following things is done
  - Disable binary logging for the duration of the statement
  - Disable multi-result-sets for the duration of the statement
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  - Value of last_insert_id() is saved and restored
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  - Value set by 'SET INSERT_ID=#' is reset and restored
  - Value for found_rows() is reset and restored
  - examined_row_count is added to the total
  - cuted_fields is added to the total
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  - new savepoint level is created and destroyed
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  NOTES:
    Seed for random() is saved for the first! usage of RAND()
    We reset examined_row_count and cuted_fields and add these to the
    result to ensure that if we have a bug that would reset these within
    a function, we are not loosing any rows from the main statement.
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    We do not reset value of last_insert_id().
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****************************************************************************/

void THD::reset_sub_statement_state(Sub_statement_state *backup,
                                    uint new_state)
{
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#ifndef EMBEDDED_LIBRARY
  /* BUG#33029, if we are replicating from a buggy master, reset
     auto_inc_intervals_forced to prevent substatement
     (triggers/functions) from using erroneous INSERT_ID value
   */
  if (rpl_master_erroneous_autoinc(this))
  {
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    DBUG_ASSERT(backup->auto_inc_intervals_forced.nb_elements() == 0);
    auto_inc_intervals_forced.swap(&backup->auto_inc_intervals_forced);
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  }
#endif
  
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  backup->option_bits=     variables.option_bits;
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  backup->count_cuted_fields= count_cuted_fields;
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  backup->in_sub_stmt=     in_sub_stmt;
  backup->enable_slow_log= enable_slow_log;
  backup->limit_found_rows= limit_found_rows;
  backup->examined_row_count= examined_row_count;
  backup->sent_row_count=   sent_row_count;
  backup->cuted_fields=     cuted_fields;
  backup->client_capabilities= client_capabilities;
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  backup->savepoints= transaction.savepoints;
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  backup->first_successful_insert_id_in_prev_stmt= 
    first_successful_insert_id_in_prev_stmt;
  backup->first_successful_insert_id_in_cur_stmt= 
    first_successful_insert_id_in_cur_stmt;
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  if ((!lex->requires_prelocking() || is_update_query(lex->sql_command)) &&
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      !is_current_stmt_binlog_format_row())
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  {
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    variables.option_bits&= ~OPTION_BIN_LOG;
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  }
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  if ((backup->option_bits & OPTION_BIN_LOG) &&
       is_update_query(lex->sql_command) &&
       !is_current_stmt_binlog_format_row())
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    mysql_bin_log.start_union_events(this, this->query_id);

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  /* Disable result sets */
  client_capabilities &= ~CLIENT_MULTI_RESULTS;
  in_sub_stmt|= new_state;
  examined_row_count= 0;
  sent_row_count= 0;
  cuted_fields= 0;
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  transaction.savepoints= 0;
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  first_successful_insert_id_in_cur_stmt= 0;
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}


void THD::restore_sub_statement_state(Sub_statement_state *backup)
{
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  DBUG_ENTER("THD::restore_sub_statement_state");
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#ifndef EMBEDDED_LIBRARY
  /* BUG#33029, if we are replicating from a buggy master, restore
     auto_inc_intervals_forced so that the top statement can use the
     INSERT_ID value set before this statement.
   */
  if (rpl_master_erroneous_autoinc(this))
  {
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    backup->auto_inc_intervals_forced.swap(&auto_inc_intervals_forced);
    DBUG_ASSERT(backup->auto_inc_intervals_forced.nb_elements() == 0);
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  }
#endif

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  /*
    To save resources we want to release savepoints which were created
    during execution of function or trigger before leaving their savepoint
    level. It is enough to release first savepoint set on this level since
    all later savepoints will be released automatically.
  */
  if (transaction.savepoints)
  {
    SAVEPOINT *sv;
    for (sv= transaction.savepoints; sv->prev; sv= sv->prev)
    {}
    /* ha_release_savepoint() never returns error. */
    (void)ha_release_savepoint(this, sv);
  }
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  count_cuted_fields= backup->count_cuted_fields;
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  transaction.savepoints= backup->savepoints;
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  variables.option_bits= backup->option_bits;
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  in_sub_stmt=      backup->in_sub_stmt;
  enable_slow_log=  backup->enable_slow_log;
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  first_successful_insert_id_in_prev_stmt= 
    backup->first_successful_insert_id_in_prev_stmt;
  first_successful_insert_id_in_cur_stmt= 
    backup->first_successful_insert_id_in_cur_stmt;
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  limit_found_rows= backup->limit_found_rows;
  sent_row_count=   backup->sent_row_count;
  client_capabilities= backup->client_capabilities;
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  /*
    If we've left sub-statement mode, reset the fatal error flag.
    Otherwise keep the current value, to propagate it up the sub-statement
    stack.
  */
  if (!in_sub_stmt)
    is_fatal_sub_stmt_error= FALSE;
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  if ((variables.option_bits & OPTION_BIN_LOG) && is_update_query(lex->sql_command) &&
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       !is_current_stmt_binlog_format_row())
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    mysql_bin_log.stop_union_events(this);
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  /*
    The following is added to the old values as we are interested in the
    total complexity of the query
  */
  examined_row_count+= backup->examined_row_count;
  cuted_fields+=       backup->cuted_fields;
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  DBUG_VOID_RETURN;
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}
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void THD::set_statement(Statement *stmt)
{
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  mysql_mutex_lock(&LOCK_thd_data);
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  Statement::set_statement(stmt);
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  mysql_mutex_unlock(&LOCK_thd_data);
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}


/** Assign a new value to thd->query.  */

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void THD::set_query(const CSET_STRING &string_arg)
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{
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  mysql_mutex_lock(&LOCK_thd_data);
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  set_query_inner(string_arg);
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  mysql_mutex_unlock(&LOCK_thd_data);
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}

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/** Assign a new value to thd->query and thd->query_id.  */

void THD::set_query_and_id(char *query_arg, uint32 query_length_arg,
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                           CHARSET_INFO *cs,
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                           query_id_t new_query_id)
{
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  mysql_mutex_lock(&LOCK_thd_data);
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  set_query_inner(query_arg, query_length_arg, cs);
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  query_id= new_query_id;
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  mysql_mutex_unlock(&LOCK_thd_data);
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}

/** Assign a new value to thd->query_id.  */

void THD::set_query_id(query_id_t new_query_id)
{
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  mysql_mutex_lock(&LOCK_thd_data);
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  query_id= new_query_id;
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  mysql_mutex_unlock(&LOCK_thd_data);
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}

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/** Assign a new value to thd->mysys_var.  */
void THD::set_mysys_var(struct st_my_thread_var *new_mysys_var)
{
  mysql_mutex_lock(&LOCK_thd_data);
  mysys_var= new_mysys_var;
  mysql_mutex_unlock(&LOCK_thd_data);
}
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/**
  Leave explicit LOCK TABLES or prelocked mode and restore value of
  transaction sentinel in MDL subsystem.
*/

void THD::leave_locked_tables_mode()
{
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  if (locked_tables_mode == LTM_LOCK_TABLES)
  {
    /*
      When leaving LOCK TABLES mode we have to change the duration of most
      of the metadata locks being held, except for HANDLER and GRL locks,
      to transactional for them to be properly released at UNLOCK TABLES.
    */
    mdl_context.set_transaction_duration_for_all_locks();
    /*
      Make sure we don't release the global read lock and commit blocker
      when leaving LTM.
    */
    global_read_lock.set_explicit_lock_duration(this);
    /* Also ensure that we don't release metadata locks for open HANDLERs. */
    if (handler_tables_hash.records)
      mysql_ha_set_explicit_lock_duration(this);
  }
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  locked_tables_mode= LTM_NONE;
}

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void THD::get_definer(LEX_USER *definer)
{
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  binlog_invoker();
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#if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
  if (slave_thread && has_invoker())
  {
    definer->user = invoker_user;
    definer->host= invoker_host;
    definer->password.str= NULL;
    definer->password.length= 0;
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    definer->plugin.str= (char *) "";
    definer->plugin.length= 0;
    definer->auth.str=  (char *) "";
    definer->auth.length= 0;
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  }
  else
#endif
    get_default_definer(this, definer);
}

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/**
  Mark transaction to rollback and mark error as fatal to a sub-statement.

  @param  thd   Thread handle
  @param  all   TRUE <=> rollback main transaction.
*/

void mark_transaction_to_rollback(THD *thd, bool all)
{
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  if (thd)
  {
    thd->is_fatal_sub_stmt_error= TRUE;
    thd->transaction_rollback_request= all;
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    /*
      Aborted transactions can not be IGNOREd.
      Switch off the IGNORE flag for the current
      SELECT_LEX. This should allow my_error()
      to report the error and abort the execution
      flow, even in presence
      of IGNORE clause.
    */
    if (thd->lex->current_select)
      thd->lex->current_select->no_error= FALSE;
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  }
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}
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/***************************************************************************
  Handling of XA id cacheing
***************************************************************************/

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mysql_mutex_t LOCK_xid_cache;
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HASH xid_cache;

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extern "C" uchar *xid_get_hash_key(const uchar *, size_t *, my_bool);
extern "C" void xid_free_hash(void *);

uchar *xid_get_hash_key(const uchar *ptr, size_t *length,
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                                  my_bool not_used __attribute__((unused)))
{
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  *length=((XID_STATE*)ptr)->xid.key_length();
  return ((XID_STATE*)ptr)->xid.key();
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}

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void xid_free_hash(void *ptr)
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{
  if (!((XID_STATE*)ptr)->in_thd)
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    my_free(ptr);
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}

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#ifdef HAVE_PSI_INTERFACE
static PSI_mutex_key key_LOCK_xid_cache;

static PSI_mutex_info all_xid_mutexes[]=
{
  { &key_LOCK_xid_cache, "LOCK_xid_cache", PSI_FLAG_GLOBAL}
};

static void init_xid_psi_keys(void)
{
  const char* category= "sql";
  int count;

  if (PSI_server == NULL)
    return;

  count= array_elements(all_xid_mutexes);
  PSI_server->register_mutex(category, all_xid_mutexes, count);
}
#endif /* HAVE_PSI_INTERFACE */

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bool xid_cache_init()
{
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#ifdef HAVE_PSI_INTERFACE
  init_xid_psi_keys();
#endif

  mysql_mutex_init(key_LOCK_xid_cache, &LOCK_xid_cache, MY_MUTEX_INIT_FAST);
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  return my_hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
                      xid_get_hash_key, xid_free_hash, 0) != 0;
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}

void xid_cache_free()
{
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  if (my_hash_inited(&xid_cache))
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  {
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    my_hash_free(&xid_cache);
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    mysql_mutex_destroy(&LOCK_xid_cache);
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  }
}

XID_STATE *xid_cache_search(XID *xid)
{
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  mysql_mutex_lock(&LOCK_xid_cache);
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  XID_STATE *res=(XID_STATE *)my_hash_search(&xid_cache, xid->key(),
                                             xid->key_length());
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  mysql_mutex_unlock(&LOCK_xid_cache);
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  return res;
}

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bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
  XID_STATE *xs;
  my_bool res;
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  mysql_mutex_lock(&LOCK_xid_cache);
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  if (my_hash_search(&xid_cache, xid->key(), xid->key_length()))
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    res=0;
  else if (!(xs=(XID_STATE *)my_malloc(sizeof(*xs), MYF(MY_WME))))
    res=1;
  else
  {
    xs->xa_state=xa_state;
    xs->xid.set(xid);
    xs->in_thd=0;
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    xs->rm_error=0;
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    res=my_hash_insert(&xid_cache, (uchar*)xs);
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  }
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  mysql_mutex_unlock(&LOCK_xid_cache);
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  return res;
}

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bool xid_cache_insert(XID_STATE *xid_state)
{
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  mysql_mutex_lock(&LOCK_xid_cache);
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  DBUG_ASSERT(my_hash_search(&xid_cache, xid_state->xid.key(),
                             xid_state->xid.key_length())==0);
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  my_bool res=my_hash_insert(&xid_cache, (uchar*)xid_state);
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  mysql_mutex_unlock(&LOCK_xid_cache);
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  return res;
}

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void xid_cache_delete(XID_STATE *xid_state)
{
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  mysql_mutex_lock(&LOCK_xid_cache);
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  my_hash_delete(&xid_cache, (uchar *)xid_state);
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  mysql_mutex_unlock(&LOCK_xid_cache);
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}

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/**
  Decide on logging format to use for the statement and issue errors
  or warnings as needed.  The decision depends on the following
  parameters:

  - The logging mode, i.e., the value of binlog_format.  Can be
    statement, mixed, or row.

  - The type of statement.  There are three types of statements:
    "normal" safe statements; unsafe statements; and row injections.
    An unsafe statement is one that, if logged in statement format,
    might produce different results when replayed on the slave (e.g.,
    INSERT DELAYED).  A row injection is either a BINLOG statement, or
    a row event executed by the slave's SQL thread.

  - The capabilities of tables modified by the statement.  The
    *capabilities vector* for a table is a set of flags associated
    with the table.  Currently, it only includes two flags: *row
    capability flag* and *statement capability flag*.

    The row capability flag is set if and only if the engine can
    handle row-based logging. The statement capability flag is set if
    and only if the table can handle statement-based logging.

  Decision table for logging format
  ---------------------------------

  The following table summarizes how the format and generated
  warning/error depends on the tables' capabilities, the statement
  type, and the current binlog_format.

     Row capable        N NNNNNNNNN YYYYYYYYY YYYYYYYYY
     Statement capable  N YYYYYYYYY NNNNNNNNN YYYYYYYYY

     Statement type     * SSSUUUIII SSSUUUIII SSSUUUIII

     binlog_format      * SMRSMRSMR SMRSMRSMR SMRSMRSMR

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     Logged format      - SS-S----- -RR-RR-RR SRRSRR-RR
     Warning/Error      1 --2732444 5--5--6-- ---7--6--
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  Legend
  ------

  Row capable:    N - Some table not row-capable, Y - All tables row-capable
  Stmt capable:   N - Some table not stmt-capable, Y - All tables stmt-capable
  Statement type: (S)afe, (U)nsafe, or Row (I)njection
  binlog_format:  (S)TATEMENT, (M)IXED, or (R)OW
  Logged format:  (S)tatement or (R)ow
  Warning/Error:  Warnings and error messages are as follows:

  1. Error: Cannot execute statement: binlogging impossible since both
     row-incapable engines and statement-incapable engines are
     involved.

  2. Error: Cannot execute statement: binlogging impossible since
     BINLOG_FORMAT = ROW and at least one table uses a storage engine
     limited to statement-logging.

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  3. Error: Cannot execute statement: binlogging of unsafe statement
     is impossible when storage engine is limited to statement-logging
     and BINLOG_FORMAT = MIXED.
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  4. Error: Cannot execute row injection: binlogging impossible since
     at least one table uses a storage engine limited to
     statement-logging.

  5. Error: Cannot execute statement: binlogging impossible since
     BINLOG_FORMAT = STATEMENT and at least one table uses a storage
     engine limited to row-logging.

  6. Error: Cannot execute row injection: binlogging impossible since
     BINLOG_FORMAT = STATEMENT.

  7. Warning: Unsafe statement binlogged in statement format since
     BINLOG_FORMAT = STATEMENT.

  In addition, we can produce the following error (not depending on
  the variables of the decision diagram):

  8. Error: Cannot execute statement: binlogging impossible since more
     than one engine is involved and at least one engine is
     self-logging.

  For each error case above, the statement is prevented from being
  logged, we report an error, and roll back the statement.  For
  warnings, we set the thd->binlog_flags variable: the warning will be
  printed only if the statement is successfully logged.

  @see THD::binlog_query

  @param[in] thd    Client thread
  @param[in] tables Tables involved in the query

  @retval 0 No error; statement can be logged.
  @retval -1 One of the error conditions above applies (1, 2, 4, 5, or 6).
*/

int THD::decide_logging_format(TABLE_LIST *tables)
{
  DBUG_ENTER("THD::decide_logging_format");
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  DBUG_PRINT("info", ("query: %s", query()));
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  DBUG_PRINT("info", ("variables.binlog_format: %lu",
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                      variables.binlog_format));
  DBUG_PRINT("info", ("lex->get_stmt_unsafe_flags(): 0x%x",
                      lex->get_stmt_unsafe_flags()));
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  /*
    We should not decide logging format if the binlog is closed or
    binlogging is off, or if the statement is filtered out from the
    binlog by filtering rules.
  */
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  if (mysql_bin_log.is_open() && (variables.option_bits & OPTION_BIN_LOG) &&
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      !(variables.binlog_format == BINLOG_FORMAT_STMT &&
        !binlog_filter->db_ok(db)))
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  {
    /*
      Compute one bit field with the union of all the engine
      capabilities, and one with the intersection of all the engine
      capabilities.
    */
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    handler::Table_flags flags_write_some_set= 0;
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    handler::Table_flags flags_access_some_set= 0;
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    handler::Table_flags flags_write_all_set=
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      HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE;

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    /* 
       If different types of engines are about to be updated.
       For example: Innodb and Falcon; Innodb and MyIsam.
    */
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    my_bool multi_write_engine= FALSE;
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    /*
       If different types of engines are about to be accessed 
       and any of them is about to be updated. For example:
       Innodb and Falcon; Innodb and MyIsam.
    */
    my_bool multi_access_engine= FALSE;
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    /*
      Identifies if a table is changed.
    */
    my_bool is_write= FALSE;
    /*
      A pointer to a previous table that was changed.
    */
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    TABLE* prev_write_table= NULL;
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    /*
      A pointer to a previous table that was accessed.
    */
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    TABLE* prev_access_table= NULL;
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#ifndef DBUG_OFF
    {
      static const char *prelocked_mode_name[] = {
        "NON_PRELOCKED",
        "PRELOCKED",
        "PRELOCKED_UNDER_LOCK_TABLES",
      };
      DBUG_PRINT("debug", ("prelocked_mode: %s",
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                           prelocked_mode_name[locked_tables_mode]));
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    }
#endif

    /*
      Get the capabilities vector for all involved storage engines and
      mask out the flags for the binary log.
    */
    for (TABLE_LIST *table= tables; table; table= table->next_global)
    {
      if (table->placeholder())
        continue;
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      if (table->table->s->table_category == TABLE_CATEGORY_PERFORMANCE ||
          table->table->s->table_category == TABLE_CATEGORY_LOG)
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        lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_TABLE);
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      handler::Table_flags const flags= table->table->file->ha_table_flags();
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      DBUG_PRINT("info", ("table: %s; ha_table_flags: 0x%llx",
                          table->table_name, flags));
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      if (table->lock_type >= TL_WRITE_ALLOW_WRITE)
      {
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        if (prev_write_table && prev_write_table->file->ht !=
            table->table->file->ht)
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          multi_write_engine= TRUE;
4159

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        my_bool trans= table->table->file->has_transactions();
4161

4162
        if (table->table->s->tmp_table)
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          lex->set_stmt_accessed_table(trans ? LEX::STMT_WRITES_TEMP_TRANS_TABLE :
                                               LEX::STMT_WRITES_TEMP_NON_TRANS_TABLE);
4165
        else
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          lex->set_stmt_accessed_table(trans ? LEX::STMT_WRITES_TRANS_TABLE :
                                               LEX::STMT_WRITES_NON_TRANS_TABLE);
4168

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        flags_write_all_set &= flags;
        flags_write_some_set |= flags;
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        is_write= TRUE;
4172

4173
        prev_write_table= table->table;
4174

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      }
      flags_access_some_set |= flags;
4177

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      if (lex->sql_command != SQLCOM_CREATE_TABLE ||
4179
          (lex->sql_command == SQLCOM_CREATE_TABLE &&
4180
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)))
4181
      {
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        my_bool trans= table->table->file->has_transactions();

        if (table->table->s->tmp_table)
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          lex->set_stmt_accessed_table(trans ? LEX::STMT_READS_TEMP_TRANS_TABLE :
                                               LEX::STMT_READS_TEMP_NON_TRANS_TABLE);
4187
        else
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          lex->set_stmt_accessed_table(trans ? LEX::STMT_READS_TRANS_TABLE :
                                               LEX::STMT_READS_NON_TRANS_TABLE);
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      }
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      if (prev_access_table && prev_access_table->file->ht !=
          table->table->file->ht)
        multi_access_engine= TRUE;

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      prev_access_table= table->table;
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    }

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    DBUG_PRINT("info", ("flags_write_all_set: 0x%llx", flags_write_all_set));
    DBUG_PRINT("info", ("flags_write_some_set: 0x%llx", flags_write_some_set));
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    DBUG_PRINT("info", ("flags_access_some_set: 0x%llx", flags_access_some_set));
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    DBUG_PRINT("info", ("multi_write_engine: %d", multi_write_engine));
4203
    DBUG_PRINT("info", ("multi_access_engine: %d", multi_access_engine));
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    int error= 0;
    int unsafe_flags;

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    bool multi_stmt_trans= in_multi_stmt_transaction_mode();
    bool trans_table= trans_has_updated_trans_table(this);
    bool binlog_direct= variables.binlog_direct_non_trans_update;
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    if (lex->is_mixed_stmt_unsafe(multi_stmt_trans, binlog_direct,
                                  trans_table, tx_isolation))
      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_MIXED_STATEMENT);
    else if (multi_stmt_trans && trans_table && !binlog_direct &&
             lex->stmt_accessed_table(LEX::STMT_WRITES_NON_TRANS_TABLE))
      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_NONTRANS_AFTER_TRANS);
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    /*
      If more than one engine is involved in the statement and at
      least one is doing it's own logging (is *self-logging*), the
      statement cannot be logged atomically, so we generate an error
      rather than allowing the binlog to become corrupt.
    */
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    if (multi_write_engine &&
        (flags_write_some_set & HA_HAS_OWN_BINLOGGING))
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      my_error((error= ER_BINLOG_MULTIPLE_ENGINES_AND_SELF_LOGGING_ENGINE),
               MYF(0));
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    else if (multi_access_engine && flags_access_some_set & HA_HAS_OWN_BINLOGGING)
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      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_MULTIPLE_ENGINES_AND_SELF_LOGGING_ENGINE);
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    /* both statement-only and row-only engines involved */
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    if ((flags_write_all_set & (HA_BINLOG_STMT_CAPABLE | HA_BINLOG_ROW_CAPABLE)) == 0)
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    {
      /*
        1. Error: Binary logging impossible since both row-incapable
           engines and statement-incapable engines are involved
      */
      my_error((error= ER_BINLOG_ROW_ENGINE_AND_STMT_ENGINE), MYF(0));
    }
    /* statement-only engines involved */
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    else if ((flags_write_all_set & HA_BINLOG_ROW_CAPABLE) == 0)
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    {
      if (lex->is_stmt_row_injection())
      {
        /*
          4. Error: Cannot execute row injection since table uses
             storage engine limited to statement-logging
        */
        my_error((error= ER_BINLOG_ROW_INJECTION_AND_STMT_ENGINE), MYF(0));
      }
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      else if (variables.binlog_format == BINLOG_FORMAT_ROW &&
               sqlcom_can_generate_row_events(this))
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      {
        /*
          2. Error: Cannot modify table that uses a storage engine
             limited to statement-logging when BINLOG_FORMAT = ROW
        */
        my_error((error= ER_BINLOG_ROW_MODE_AND_STMT_ENGINE), MYF(0));
      }
      else if ((unsafe_flags= lex->get_stmt_unsafe_flags()) != 0)
      {
        /*
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          3. Error: Cannot execute statement: binlogging of unsafe
             statement is impossible when storage engine is limited to
             statement-logging and BINLOG_FORMAT = MIXED.
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        */
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        for (int unsafe_type= 0;
             unsafe_type < LEX::BINLOG_STMT_UNSAFE_COUNT;
             unsafe_type++)
          if (unsafe_flags & (1 << unsafe_type))
            my_error((error= ER_BINLOG_UNSAFE_AND_STMT_ENGINE), MYF(0),
                     ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
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      }
      /* log in statement format! */
    }
    /* no statement-only engines */
    else
    {
      /* binlog_format = STATEMENT */
      if (variables.binlog_format == BINLOG_FORMAT_STMT)
      {
        if (lex->is_stmt_row_injection())
        {
          /*
            6. Error: Cannot execute row injection since
               BINLOG_FORMAT = STATEMENT
          */
          my_error((error= ER_BINLOG_ROW_INJECTION_AND_STMT_MODE), MYF(0));
        }
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        else if ((flags_write_all_set & HA_BINLOG_STMT_CAPABLE) == 0 &&
                 sqlcom_can_generate_row_events(this))
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        {
          /*
            5. Error: Cannot modify table that uses a storage engine
               limited to row-logging when binlog_format = STATEMENT
          */
          my_error((error= ER_BINLOG_STMT_MODE_AND_ROW_ENGINE), MYF(0), "");
        }
4300
        else if (is_write && (unsafe_flags= lex->get_stmt_unsafe_flags()) != 0)
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        {
          /*
            7. Warning: Unsafe statement logged as statement due to
               binlog_format = STATEMENT
          */
4306
          binlog_unsafe_warning_flags|= unsafe_flags;
4307

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          DBUG_PRINT("info", ("Scheduling warning to be issued by "
                              "binlog_query: '%s'",
                              ER(ER_BINLOG_UNSAFE_STATEMENT)));
4311
          DBUG_PRINT("info", ("binlog_unsafe_warning_flags: 0x%x",
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                              binlog_unsafe_warning_flags));
        }
        /* log in statement format! */
      }
      /* No statement-only engines and binlog_format != STATEMENT.
         I.e., nothing prevents us from row logging if needed. */
      else
      {
        if (lex->is_stmt_unsafe() || lex->is_stmt_row_injection()
4321
            || (flags_write_all_set & HA_BINLOG_STMT_CAPABLE) == 0)
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        {
          /* log in row format! */
4324
          set_current_stmt_binlog_format_row_if_mixed();
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        }
      }
    }

    if (error) {
      DBUG_PRINT("info", ("decision: no logging since an error was generated"));
      DBUG_RETURN(-1);
    }
    DBUG_PRINT("info", ("decision: logging in %s format",
                        is_current_stmt_binlog_format_row() ?
                        "ROW" : "STATEMENT"));
  }
#ifndef DBUG_OFF
  else
    DBUG_PRINT("info", ("decision: no logging since "
                        "mysql_bin_log.is_open() = %d "
4341
                        "and (options & OPTION_BIN_LOG) = 0x%llx "
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4342
                        "and binlog_format = %lu "
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                        "and binlog_filter->db_ok(db) = %d",
                        mysql_bin_log.is_open(),
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                        (variables.option_bits & OPTION_BIN_LOG),
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                        variables.binlog_format,
                        binlog_filter->db_ok(db)));
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#endif

  DBUG_RETURN(0);
}


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/*
  Implementation of interface to write rows to the binary log through the
  thread.  The thread is responsible for writing the rows it has
  inserted/updated/deleted.
*/

#ifndef MYSQL_CLIENT

/*
  Template member function for ensuring that there is an rows log
  event of the apropriate type before proceeding.

  PRE CONDITION:
    - Events of type 'RowEventT' have the type code 'type_code'.
    
  POST CONDITION:
    If a non-NULL pointer is returned, the pending event for thread 'thd' will
    be an event of type 'RowEventT' (which have the type code 'type_code')
    will either empty or have enough space to hold 'needed' bytes.  In
    addition, the columns bitmap will be correct for the row, meaning that
    the pending event will be flushed if the columns in the event differ from
    the columns suppled to the function.

  RETURNS
    If no error, a non-NULL pending event (either one which already existed or
    the newly created one).
    If error, NULL.
 */

template <class RowsEventT> Rows_log_event* 
THD::binlog_prepare_pending_rows_event(TABLE* table, uint32 serv_id,
                                       MY_BITMAP const* cols,
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                                       size_t colcnt,
                                       size_t needed,
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                                       bool is_transactional,
				       RowsEventT *hint __attribute__((unused)))
4390
{
4391
  DBUG_ENTER("binlog_prepare_pending_rows_event");
4392
  /* Pre-conditions */
4393
  DBUG_ASSERT(table->s->table_map_id != ~0UL);
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  /* Fetch the type code for the RowsEventT template parameter */
  int const type_code= RowsEventT::TYPE_CODE;

  /*
    There is no good place to set up the transactional data, so we
    have to do it here.
  */
  if (binlog_setup_trx_data())
4403
    DBUG_RETURN(NULL);
4404

4405
  Rows_log_event* pending= binlog_get_pending_rows_event(is_transactional);
4406 4407

  if (unlikely(pending && !pending->is_valid()))
4408
    DBUG_RETURN(NULL);
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  /*
    Check if the current event is non-NULL and a write-rows
    event. Also check if the table provided is mapped: if it is not,
    then we have switched to writing to a new table.
    If there is no pending event, we need to create one. If there is a pending
    event, but it's not about the same table id, or not of the same type
    (between Write, Update and Delete), or not the same affected columns, or
    going to be too big, flush this event to disk and create a new pending
    event.
  */
  if (!pending ||
      pending->server_id != serv_id || 
      pending->get_table_id() != table->s->table_map_id ||
      pending->get_type_code() != type_code || 
      pending->get_data_size() + needed > opt_binlog_rows_event_max_size || 
      pending->get_width() != colcnt ||
      !bitmap_cmp(pending->get_cols(), cols)) 
  {
    /* Create a new RowsEventT... */
    Rows_log_event* const
	ev= new RowsEventT(this, table, table->s->table_map_id, cols,
                           is_transactional);
    if (unlikely(!ev))
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      DBUG_RETURN(NULL);
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    ev->server_id= serv_id; // I don't like this, it's too easy to forget.
    /*
      flush the pending event and replace it with the newly created
      event...
    */
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    if (unlikely(
        mysql_bin_log.flush_and_set_pending_rows_event(this, ev,
                                                       is_transactional)))
4442 4443
    {
      delete ev;
4444
      DBUG_RETURN(NULL);
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    }

4447
    DBUG_RETURN(ev);               /* This is the new pending event */
4448
  }
4449
  DBUG_RETURN(pending);        /* This is the current pending event */
4450 4451
}

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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
4453
/*
4454
  Instantiate the versions we need, we have -fno-implicit-template as
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  compiling option.
*/
template Rows_log_event*
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THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
4459
				       size_t, size_t, bool,
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				       Write_rows_log_event*);
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template Rows_log_event*
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THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
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				       size_t colcnt, size_t, bool,
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				       Delete_rows_log_event *);
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template Rows_log_event* 
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THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
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				       size_t colcnt, size_t, bool,
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				       Update_rows_log_event *);
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#endif
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/* Declare in unnamed namespace. */
CPP_UNNAMED_NS_START

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  /**
     Class to handle temporary allocation of memory for row data.

     The responsibilities of the class is to provide memory for
     packing one or two rows of packed data (depending on what
     constructor is called).

     In order to make the allocation more efficient for "simple" rows,
     i.e., rows that do not contain any blobs, a pointer to the
     allocated memory is of memory is stored in the table structure
     for simple rows.  If memory for a table containing a blob field
     is requested, only memory for that is allocated, and subsequently
     released when the object is destroyed.

   */
  class Row_data_memory {
  public:
    /**
      Build an object to keep track of a block-local piece of memory
      for storing a row of data.

      @param table
      Table where the pre-allocated memory is stored.

      @param length
      Length of data that is needed, if the record contain blobs.
     */
4503
    Row_data_memory(TABLE *table, size_t const len1)
4504 4505 4506
      : m_memory(0)
    {
#ifndef DBUG_OFF
4507
      m_alloc_checked= FALSE;
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#endif
      allocate_memory(table, len1);
      m_ptr[0]= has_memory() ? m_memory : 0;
      m_ptr[1]= 0;
    }

4514
    Row_data_memory(TABLE *table, size_t const len1, size_t const len2)
4515 4516 4517
      : m_memory(0)
    {
#ifndef DBUG_OFF
4518
      m_alloc_checked= FALSE;
4519 4520 4521 4522 4523 4524 4525 4526 4527
#endif
      allocate_memory(table, len1 + len2);
      m_ptr[0]= has_memory() ? m_memory        : 0;
      m_ptr[1]= has_memory() ? m_memory + len1 : 0;
    }

    ~Row_data_memory()
    {
      if (m_memory != 0 && m_release_memory_on_destruction)
4528
        my_free(m_memory);
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    }

    /**
       Is there memory allocated?

       @retval true There is memory allocated
       @retval false Memory allocation failed
     */
    bool has_memory() const {
#ifndef DBUG_OFF
4539
      m_alloc_checked= TRUE;
4540 4541 4542 4543
#endif
      return m_memory != 0;
    }

4544
    uchar *slot(uint s)
4545
    {
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4546
      DBUG_ASSERT(s < sizeof(m_ptr)/sizeof(*m_ptr));
4547
      DBUG_ASSERT(m_ptr[s] != 0);
4548
      DBUG_ASSERT(m_alloc_checked == TRUE);
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      return m_ptr[s];
    }

  private:
4553
    void allocate_memory(TABLE *const table, size_t const total_length)
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    {
      if (table->s->blob_fields == 0)
      {
        /*
          The maximum length of a packed record is less than this
          length. We use this value instead of the supplied length
          when allocating memory for records, since we don't know how
          the memory will be used in future allocations.

          Since table->s->reclength is for unpacked records, we have
          to add two bytes for each field, which can potentially be
          added to hold the length of a packed field.
        */
4567
        size_t const maxlen= table->s->reclength + 2 * table->s->fields;
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        /*
          Allocate memory for two records if memory hasn't been
          allocated. We allocate memory for two records so that it can
          be used when processing update rows as well.
        */
        if (table->write_row_record == 0)
          table->write_row_record=
4576
            (uchar *) alloc_root(&table->mem_root, 2 * maxlen);
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        m_memory= table->write_row_record;
4578
        m_release_memory_on_destruction= FALSE;
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      }
      else
      {
4582
        m_memory= (uchar *) my_malloc(total_length, MYF(MY_WME));
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        m_release_memory_on_destruction= TRUE;
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      }
    }

#ifndef DBUG_OFF
    mutable bool m_alloc_checked;
#endif
    bool m_release_memory_on_destruction;
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    uchar *m_memory;
    uchar *m_ptr[2];
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  };

4595
CPP_UNNAMED_NS_END
4596

4597
int THD::binlog_write_row(TABLE* table, bool is_trans, 
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                          MY_BITMAP const* cols, size_t colcnt, 
                          uchar const *record) 
4600
{ 
4601
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
4602

4603 4604 4605
  /*
    Pack records into format for transfer. We are allocating more
    memory than needed, but that doesn't matter.
4606
  */
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  Row_data_memory memory(table, max_row_length(table, record));
  if (!memory.has_memory())
    return HA_ERR_OUT_OF_MEM;
4610

4611
  uchar *row_data= memory.slot(0);
4612

4613
  size_t const len= pack_row(table, cols, row_data, record);
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  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
                                      len, is_trans,
                                      static_cast<Write_rows_log_event*>(0));

  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return ev->add_row_data(row_data, len);
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}

int THD::binlog_update_row(TABLE* table, bool is_trans,
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                           MY_BITMAP const* cols, size_t colcnt,
                           const uchar *before_record,
                           const uchar *after_record)
4630
{ 
4631
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
4632

4633 4634
  size_t const before_maxlen = max_row_length(table, before_record);
  size_t const after_maxlen  = max_row_length(table, after_record);
4635

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  Row_data_memory row_data(table, before_maxlen, after_maxlen);
  if (!row_data.has_memory())
    return HA_ERR_OUT_OF_MEM;

4640 4641
  uchar *before_row= row_data.slot(0);
  uchar *after_row= row_data.slot(1);
4642

4643
  size_t const before_size= pack_row(table, cols, before_row,
4644
                                        before_record);
4645
  size_t const after_size= pack_row(table, cols, after_row,
4646
                                       after_record);
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  /*
    Don't print debug messages when running valgrind since they can
    trigger false warnings.
   */
#ifndef HAVE_purify
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  DBUG_DUMP("before_record", before_record, table->s->reclength);
  DBUG_DUMP("after_record",  after_record, table->s->reclength);
  DBUG_DUMP("before_row",    before_row, before_size);
  DBUG_DUMP("after_row",     after_row, after_size);
4657
#endif
4658

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  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
				      before_size + after_size, is_trans,
				      static_cast<Update_rows_log_event*>(0));
4663

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  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return
4668
    ev->add_row_data(before_row, before_size) ||
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    ev->add_row_data(after_row, after_size);
}

int THD::binlog_delete_row(TABLE* table, bool is_trans, 
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                           MY_BITMAP const* cols, size_t colcnt,
                           uchar const *record)
4675
{ 
4676
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
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  /* 
     Pack records into format for transfer. We are allocating more
     memory than needed, but that doesn't matter.
  */
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  Row_data_memory memory(table, max_row_length(table, record));
  if (unlikely(!memory.has_memory()))
4684
    return HA_ERR_OUT_OF_MEM;
4685

4686
  uchar *row_data= memory.slot(0);
4687

4688
  size_t const len= pack_row(table, cols, row_data, record);
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  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
				      len, is_trans,
				      static_cast<Delete_rows_log_event*>(0));
4694

4695 4696
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;
4697

4698
  return ev->add_row_data(row_data, len);
4699 4700 4701
}


4702 4703
int THD::binlog_remove_pending_rows_event(bool clear_maps,
                                          bool is_transactional)
4704
{
4705
  DBUG_ENTER("THD::binlog_remove_pending_rows_event");
4706 4707 4708 4709

  if (!mysql_bin_log.is_open())
    DBUG_RETURN(0);

4710
  mysql_bin_log.remove_pending_rows_event(this, is_transactional);
4711 4712 4713 4714 4715 4716 4717

  if (clear_maps)
    binlog_table_maps= 0;

  DBUG_RETURN(0);
}

4718
int THD::binlog_flush_pending_rows_event(bool stmt_end, bool is_transactional)
4719 4720
{
  DBUG_ENTER("THD::binlog_flush_pending_rows_event");
4721 4722 4723 4724 4725 4726
  /*
    We shall flush the pending event even if we are not in row-based
    mode: it might be the case that we left row-based mode before
    flushing anything (e.g., if we have explicitly locked tables).
   */
  if (!mysql_bin_log.is_open())
4727 4728 4729 4730 4731 4732 4733
    DBUG_RETURN(0);

  /*
    Mark the event as the last event of a statement if the stmt_end
    flag is set.
  */
  int error= 0;
4734
  if (Rows_log_event *pending= binlog_get_pending_rows_event(is_transactional))
4735 4736 4737 4738
  {
    if (stmt_end)
    {
      pending->set_flags(Rows_log_event::STMT_END_F);
4739
      binlog_table_maps= 0;
4740 4741
    }

4742 4743
    error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0,
                                                          is_transactional);
4744
  }
4745 4746 4747 4748 4749

  DBUG_RETURN(error);
}


4750
#if !defined(DBUG_OFF) && !defined(_lint)
4751 4752 4753 4754 4755 4756 4757 4758
static const char *
show_query_type(THD::enum_binlog_query_type qtype)
{
  switch (qtype) {
  case THD::ROW_QUERY_TYPE:
    return "ROW";
  case THD::STMT_QUERY_TYPE:
    return "STMT";
4759
  case THD::QUERY_TYPE_COUNT:
4760
  default:
4761
    DBUG_ASSERT(0 <= qtype && qtype < THD::QUERY_TYPE_COUNT);
4762
  }
4763 4764 4765
  static char buf[64];
  sprintf(buf, "UNKNOWN#%d", qtype);
  return buf;
4766
}
4767
#endif
4768 4769


4770 4771
/**
  Auxiliary method used by @c binlog_query() to raise warnings.
4772

4773 4774
  The type of warning and the type of unsafeness is stored in
  THD::binlog_unsafe_warning_flags.
4775 4776 4777 4778 4779 4780 4781 4782
*/
void THD::issue_unsafe_warnings()
{
  DBUG_ENTER("issue_unsafe_warnings");
  /*
    Ensure that binlog_unsafe_warning_flags is big enough to hold all
    bits.  This is actually a constant expression.
  */
4783
  DBUG_ASSERT(LEX::BINLOG_STMT_UNSAFE_COUNT <=
4784
              sizeof(binlog_unsafe_warning_flags) * CHAR_BIT);
4785

4786
  uint32 unsafe_type_flags= binlog_unsafe_warning_flags;
4787 4788 4789 4790 4791 4792 4793 4794 4795 4796
  /*
    For each unsafe_type, check if the statement is unsafe in this way
    and issue a warning.
  */
  for (int unsafe_type=0;
       unsafe_type < LEX::BINLOG_STMT_UNSAFE_COUNT;
       unsafe_type++)
  {
    if ((unsafe_type_flags & (1 << unsafe_type)) != 0)
    {
4797 4798 4799 4800
      push_warning_printf(this, MYSQL_ERROR::WARN_LEVEL_NOTE,
                          ER_BINLOG_UNSAFE_STATEMENT,
                          ER(ER_BINLOG_UNSAFE_STATEMENT),
                          ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
4801
      if (global_system_variables.log_warnings)
4802 4803 4804 4805
      {
        char buf[MYSQL_ERRMSG_SIZE * 2];
        sprintf(buf, ER(ER_BINLOG_UNSAFE_STATEMENT),
                ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
4806
        sql_print_warning(ER(ER_MESSAGE_AND_STATEMENT), buf, query());
4807
      }
4808 4809 4810 4811 4812 4813
    }
  }
  DBUG_VOID_RETURN;
}


4814 4815
/**
  Log the current query.
4816

4817
  The query will be logged in either row format or statement format
4818
  depending on the value of @c current_stmt_binlog_format_row field and
4819
  the value of the @c qtype parameter.
4820

4821
  This function must be called:
4822

4823
  - After the all calls to ha_*_row() functions have been issued.
4824

4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837
  - After any writes to system tables. Rationale: if system tables
    were written after a call to this function, and the master crashes
    after the call to this function and before writing the system
    tables, then the master and slave get out of sync.

  - Before tables are unlocked and closed.

  @see decide_logging_format

  @retval 0 Success

  @retval nonzero If there is a failure when writing the query (e.g.,
  write failure), then the error code is returned.
4838
*/
4839
int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
4840 4841
                      ulong query_len, bool is_trans, bool direct, 
                      bool suppress_use, int errcode)
4842 4843
{
  DBUG_ENTER("THD::binlog_query");
4844 4845
  DBUG_PRINT("enter", ("qtype: %s  query: '%s'",
                       show_query_type(qtype), query_arg));
4846
  DBUG_ASSERT(query_arg && mysql_bin_log.is_open());
4847

4848 4849 4850 4851 4852 4853 4854 4855 4856
  /*
    If we are not in prelocked mode, mysql_unlock_tables() will be
    called after this binlog_query(), so we have to flush the pending
    rows event with the STMT_END_F set to unlock all tables at the
    slave side as well.

    If we are in prelocked mode, the flushing will be done inside the
    top-most close_thread_tables().
  */
Konstantin Osipov's avatar
Konstantin Osipov committed
4857
  if (this->locked_tables_mode <= LTM_LOCK_TABLES)
4858
    if (int error= binlog_flush_pending_rows_event(TRUE, is_trans))
4859 4860
      DBUG_RETURN(error);

4861
  /*
4862
    Warnings for unsafe statements logged in statement format are
4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876
    printed in three places instead of in decide_logging_format().
    This is because the warnings should be printed only if the statement
    is actually logged. When executing decide_logging_format(), we cannot
    know for sure if the statement will be logged:

    1 - sp_head::execute_procedure which prints out warnings for calls to
    stored procedures.

    2 - sp_head::execute_function which prints out warnings for calls
    involving functions.

    3 - THD::binlog_query (here) which prints warning for top level
    statements not covered by the two cases above: i.e., if not insided a
    procedure and a function.
4877 4878 4879 4880 4881

    Besides, we should not try to print these warnings if it is not
    possible to write statements to the binary log as it happens when
    the execution is inside a function, or generaly speaking, when
    the variables.option_bits & OPTION_BIN_LOG is false.
4882
    
4883
  */
4884 4885
  if ((variables.option_bits & OPTION_BIN_LOG) &&
      spcont == NULL && !binlog_evt_union.do_union)
4886
    issue_unsafe_warnings();
4887

4888

4889
  switch (qtype) {
4890 4891 4892
    /*
      ROW_QUERY_TYPE means that the statement may be logged either in
      row format or in statement format.  If
4893
      current_stmt_binlog_format is row, it means that the
4894 4895 4896
      statement has already been logged in row format and hence shall
      not be logged again.
    */
4897
  case THD::ROW_QUERY_TYPE:
4898
    DBUG_PRINT("debug",
4899
               ("is_current_stmt_binlog_format_row: %d",
4900 4901
                is_current_stmt_binlog_format_row()));
    if (is_current_stmt_binlog_format_row())
4902
      DBUG_RETURN(0);
4903
    /* Fall through */
4904

4905 4906 4907 4908
    /*
      STMT_QUERY_TYPE means that the query must be logged in statement
      format; it cannot be logged in row format.  This is typically
      used by DDL statements.  It is an error to use this query type
4909
      if current_stmt_binlog_format_row is row.
4910 4911

      @todo Currently there are places that call this method with
4912
      STMT_QUERY_TYPE and current_stmt_binlog_format is row.  Fix those
4913
      places and add assert to ensure correct behavior. /Sven
4914 4915 4916
    */
  case THD::STMT_QUERY_TYPE:
    /*
4917 4918
      The MYSQL_LOG::write() function will set the STMT_END_F flag and
      flush the pending rows event if necessary.
4919
    */
4920
    {
4921 4922
      Query_log_event qinfo(this, query_arg, query_len, is_trans, direct,
                            suppress_use, errcode);
4923 4924 4925 4926 4927 4928 4929 4930 4931
      /*
        Binlog table maps will be irrelevant after a Query_log_event
        (they are just removed on the slave side) so after the query
        log event is written to the binary log, we pretend that no
        table maps were written.
       */
      int error= mysql_bin_log.write(&qinfo);
      binlog_table_maps= 0;
      DBUG_RETURN(error);
4932 4933 4934 4935 4936 4937 4938 4939 4940 4941
    }
    break;

  case THD::QUERY_TYPE_COUNT:
  default:
    DBUG_ASSERT(0 <= qtype && qtype < QUERY_TYPE_COUNT);
  }
  DBUG_RETURN(0);
}

4942 4943 4944 4945 4946 4947 4948 4949 4950
bool Discrete_intervals_list::append(ulonglong start, ulonglong val,
                                 ulonglong incr)
{
  DBUG_ENTER("Discrete_intervals_list::append");
  /* first, see if this can be merged with previous */
  if ((head == NULL) || tail->merge_if_contiguous(start, val, incr))
  {
    /* it cannot, so need to add a new interval */
    Discrete_interval *new_interval= new Discrete_interval(start, val, incr);
4951
    DBUG_RETURN(append(new_interval));
4952 4953 4954 4955
  }
  DBUG_RETURN(0);
}

4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970
bool Discrete_intervals_list::append(Discrete_interval *new_interval)
{
  DBUG_ENTER("Discrete_intervals_list::append");
  if (unlikely(new_interval == NULL))
    DBUG_RETURN(1);
  DBUG_PRINT("info",("adding new auto_increment interval"));
  if (head == NULL)
    head= current= new_interval;
  else
    tail->next= new_interval;
  tail= new_interval;
  elements++;
  DBUG_RETURN(0);
}

4971
#endif /* !defined(MYSQL_CLIENT) */