sql_class.cc 99.1 KB
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/* Copyright (C) 2000-2006 MySQL AB
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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
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/*****************************************************************************
**
** 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

#include "mysql_priv.h"
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#include "rpl_rli.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 <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 "sp_rcontext.h"
#include "sp_cache.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)
    my_free(entry->value, MYF(0));
  my_free((char*) entry,MYF(0));
}

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

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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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Open_tables_state::Open_tables_state(ulong version_arg)
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  :version(version_arg), state_flags(0U)
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{
  reset_open_tables_state();
}

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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(THD *thd, const char *info, 
                              const char *calling_function, 
                              const char *calling_file, 
                              const unsigned int calling_line)
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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));
#if defined(ENABLED_PROFILING) && defined(COMMUNITY_SERVER)
  thd->profiling.status_change(info, calling_function, calling_file, calling_line);
#endif
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  thd->proc_info= info;
  return old_info;
}

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extern "C"
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void **thd_ha_data(const THD *thd, const struct handlerton *hton)
{
  return (void **) thd->ha_data + hton->slot;
}

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

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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)
{
  return (int) thd->variables.tx_isolation;
}

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extern "C"
void thd_inc_row_count(THD *thd)
{
  thd->row_count++;
}
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/*
  Dumps a text description of a thread, its security context
  (user, host) and the current query.
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  SYNOPSIS
    thd_security_context()
    thd                 current thread context
    buffer              pointer to preferred result buffer
    length              length of buffer
    max_query_len       how many chars of query to copy (0 for all)
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  RETURN VALUES
    pointer to string
*/
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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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  len= my_snprintf(header, sizeof(header),
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                   "MySQL thread id %lu, query id %lu",
                   thd->thread_id, (ulong) thd->query_id);
  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);
  }

  if (thd->proc_info)
  {
    str.append(' ');
    str.append(thd->proc_info);
  }

  if (thd->query)
  {
    if (max_query_len < 1)
      len= thd->query_length;
    else
      len= min(thd->query_length, max_query_len);
    str.append('\n');
    str.append(thd->query, len);
  }
  if (str.c_ptr_safe() == buffer)
    return buffer;
  return thd->strmake(str.ptr(), str.length());
}
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/**
  Clear this diagnostics area. 

  Normally called at the end of a statement.
*/

void
Diagnostics_area::reset_diagnostics_area()
{
#ifdef DBUG_OFF
  can_overwrite_status= FALSE;
  /** Don't take chances in production */
  m_message[0]= '\0';
  m_sql_errno= 0;
  m_server_status= 0;
  m_affected_rows= 0;
  m_last_insert_id= 0;
  m_total_warn_count= 0;
#endif
  is_sent= FALSE;
  /** Tiny reset in debug mode to see garbage right away */
  m_status= DA_EMPTY;
}


/**
  Set OK status -- ends commands that do not return a
  result set, e.g. INSERT/UPDATE/DELETE.
*/

void
Diagnostics_area::set_ok_status(THD *thd, ha_rows affected_rows_arg,
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                                ulonglong last_insert_id_arg,
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                                const char *message_arg)
{
  DBUG_ASSERT(! is_set());
#ifdef DBUG_OFF
  /* In production, refuse to overwrite an error with an OK packet. */
  if (is_error())
    return;
#endif
  /** Only allowed to report success if has not yet reported an error */

  m_server_status= thd->server_status;
  m_total_warn_count= thd->total_warn_count;
  m_affected_rows= affected_rows_arg;
  m_last_insert_id= last_insert_id_arg;
  if (message_arg)
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    strmake(m_message, message_arg, sizeof(m_message) - 1);
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  else
    m_message[0]= '\0';
  m_status= DA_OK;
}


/**
  Set EOF status.
*/

void
Diagnostics_area::set_eof_status(THD *thd)
{
  /** Only allowed to report eof if has not yet reported an error */

  DBUG_ASSERT(! is_set());
#ifdef DBUG_OFF
  /* In production, refuse to overwrite an error with an EOF packet. */
  if (is_error())
    return;
#endif

  m_server_status= thd->server_status;
  /*
    If inside a stored procedure, do not return the total
    number of warnings, since they are not available to the client
    anyway.
  */
  m_total_warn_count= thd->spcont ? 0 : thd->total_warn_count;

  m_status= DA_EOF;
}

/**
  Set ERROR status.
*/

void
Diagnostics_area::set_error_status(THD *thd, uint sql_errno_arg,
                                   const char *message_arg)
{
  /*
    Only allowed to report error if has not yet reported a success
    The only exception is when we flush the message to the client,
    an error can happen during the flush.
  */
  DBUG_ASSERT(! is_set() || can_overwrite_status);

  m_sql_errno= sql_errno_arg;
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  strmake(m_message, message_arg, sizeof(m_message) - 1);
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  m_status= DA_ERROR;
}


/**
  Mark the diagnostics area as 'DISABLED'.

  This is used in rare cases when the COM_ command at hand sends a response
  in a custom format. One example is the query cache, another is
  COM_STMT_PREPARE.
*/

void
Diagnostics_area::disable_status()
{
  DBUG_ASSERT(! is_set());
  m_status= DA_DISABLED;
}
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THD::THD()
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   :Statement(&main_lex, &main_mem_root, CONVENTIONAL_EXECUTION,
              /* statement id */ 0),
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   Open_tables_state(refresh_version), rli_fake(0),
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   lock_id(&main_lock_id),
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   user_time(0), in_sub_stmt(0),
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   binlog_table_maps(0), binlog_flags(0UL),
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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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   global_read_lock(0),
   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),
   m_lip(NULL)
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{
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  ulong tmp;

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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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  locked=some_tables_deleted=no_errors=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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  hash_clear(&handler_tables_hash);
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  tmp_table=0;
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  used_tables=0;
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  cuted_fields= sent_row_count= row_count= 0L;
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  limit_found_rows= 0;
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  row_count_func= -1;
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  statement_id_counter= 0UL;
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#ifdef ERROR_INJECT_SUPPORT
  error_inject_value= 0UL;
#endif
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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= 0L;
  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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  warn_id= 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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  net.vio=0;
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#endif
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  client_capabilities= 0;                       // minimalistic client
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#ifdef HAVE_QUERY_CACHE
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  query_cache_init_query(&net);                 // If error on boot
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#endif
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  ull=0;
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  system_thread= NON_SYSTEM_THREAD;
  cleanup_done= abort_on_warning= no_warnings_for_error= 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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#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
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#endif
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  pthread_mutex_init(&LOCK_delete, 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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  init();
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  /* Initialize sub structures */
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  init_sql_alloc(&warn_root, WARN_ALLOC_BLOCK_SIZE, WARN_ALLOC_PREALLOC_SIZE);
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#if defined(ENABLED_PROFILING) && defined(COMMUNITY_SERVER)
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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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  hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
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	    (hash_get_key) get_var_key,
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	    (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 */
  thr_lock_owner_init(&main_lock_id, &lock_info);
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  m_internal_handler= NULL;
}


void THD::push_internal_handler(Internal_error_handler *handler)
{
  /*
    TODO: The current implementation is limited to 1 handler at a time only.
    THD and sp_rcontext need to be modified to use a common handler stack.
  */
  DBUG_ASSERT(m_internal_handler == NULL);
  m_internal_handler= handler;
}


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bool THD::handle_error(uint sql_errno, const char *message,
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                       MYSQL_ERROR::enum_warning_level level)
{
  if (m_internal_handler)
  {
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    return m_internal_handler->handle_error(sql_errno, message, level, this);
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  }

  return FALSE;                                 // 'FALSE', as per coding style
}


void THD::pop_internal_handler()
{
  DBUG_ASSERT(m_internal_handler != NULL);
  m_internal_handler= NULL;
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}

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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);
}

void thd_get_xid(const MYSQL_THD thd, MYSQL_XID *xid)
{
  *xid = *(MYSQL_XID *) &thd->transaction.xid_state.xid;
}
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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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  pthread_mutex_lock(&LOCK_global_system_variables);
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  plugin_thdvar_init(this);
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  variables.time_format= date_time_format_copy((THD*) 0,
					       variables.time_format);
  variables.date_format= date_time_format_copy((THD*) 0,
					       variables.date_format);
  variables.datetime_format= date_time_format_copy((THD*) 0,
						   variables.datetime_format);
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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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  pthread_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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  options= thd_startup_options;
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  if (variables.max_join_size == HA_POS_ERROR)
    options |= OPTION_BIG_SELECTS;
  else
    options &= ~OPTION_BIG_SELECTS;

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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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  session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
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  warn_list.empty();
  bzero((char*) warn_count, sizeof(warn_count));
  total_warn_count= 0;
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  update_charset();
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  reset_current_stmt_binlog_row_based();
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  bzero((char *) &status_var, sizeof(status_var));
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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);
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#ifdef USING_TRANSACTIONS
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  reset_root_defaults(&transaction.mem_root,
                      variables.trans_alloc_block_size,
                      variables.trans_prealloc_size);
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#endif
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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)
{
  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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  hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
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	    (hash_get_key) get_var_key,
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	    (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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    ha_rollback(this);
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    xid_cache_delete(&transaction.xid_state);
  }
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  if (locked_tables)
  {
    lock=locked_tables; locked_tables=0;
    close_thread_tables(this);
  }
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  mysql_ha_cleanup(this);
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  delete_dynamic(&user_var_events);
  hash_free(&user_vars);
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  close_temporary_tables(this);
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  my_free((char*) variables.time_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.date_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.datetime_format, MYF(MY_ALLOW_ZERO_PTR));
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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 (global_read_lock)
    unlock_global_read_lock(this);
  if (ull)
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  {
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    pthread_mutex_lock(&LOCK_user_locks);
    item_user_lock_release(ull);
    pthread_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 */
  pthread_mutex_lock(&LOCK_delete);
  pthread_mutex_unlock(&LOCK_delete);
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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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  DBUG_ASSERT(lock_info.n_cursors == 0);
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  if (!cleanup_done)
    cleanup();
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  ha_close_connection(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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  safeFree(db);
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  free_root(&warn_root,MYF(0));
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#ifdef USING_TRANSACTIONS
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  free_root(&transaction.mem_root,MYF(0));
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#endif
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  mysys_var=0;					// Safety (shouldn't be needed)
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  pthread_mutex_destroy(&LOCK_delete);
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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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#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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/*
  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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						  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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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: 0x%lx", (long) this));
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  THD_CHECK_SENTRY(this);
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  safe_mutex_assert_owner(&LOCK_delete); 

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  killed= state_to_set;
  if (state_to_set != THD::KILL_QUERY)
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  {
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    thr_alarm_kill(thread_id);
    if (!slave_thread)
      thread_scheduler.post_kill_notification(this);
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#ifdef SIGNAL_WITH_VIO_CLOSE
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    if (this != current_thd)
    {
      /*
        In addition to a signal, let's close the socket of the thread that
        is being killed. 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.

        If we're killing ourselves, we know that we're not blocked, so this
        hack is not used.
      */

      close_active_vio();
    }
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#endif    
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  }
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  if (mysys_var)
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  {
    pthread_mutex_lock(&mysys_var->mutex);
    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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    */
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    if (mysys_var->current_cond && mysys_var->current_mutex)
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    {
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      pthread_mutex_lock(mysys_var->current_mutex);
      pthread_cond_broadcast(mysys_var->current_cond);
      pthread_mutex_unlock(mysys_var->current_mutex);
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    }
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    pthread_mutex_unlock(&mysys_var->mutex);
  }
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  DBUG_VOID_RETURN;
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}

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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;
  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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/*
  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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}

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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)
{
  if (allocate_lex_string)
    if (!(lex_str= (LEX_STRING *)alloc(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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/*
  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;
  charset_is_system_charset= !String::needs_conversion(0,charset(),
                                                       system_charset_info,
                                                       &not_used);
  charset_is_collation_connection= 
    !String::needs_conversion(0,charset(),variables.collation_connection,
                              &not_used);
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  charset_is_character_set_filesystem= 
    !String::needs_conversion(0, charset(),
                              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((options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) &&
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	      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_fields(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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  safe_mutex_assert_owner(&LOCK_delete); 
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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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sql_exchange::sql_exchange(char *name,bool flag)
  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
  field_term= &default_field_term;
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  enclosed=   line_start= &my_empty_string;
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  line_term=  &default_line_term;
  escaped=    &default_escaped;
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  cs= NULL;
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}

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bool select_send::send_fields(List<Item> &list, uint flags)
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{
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  bool res;
  if (!(res= thd->protocol->send_fields(&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()
{
  DBUG_ENTER("select_send::abort");
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  if (is_result_set_started && thd->spcont &&
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      thd->spcont->find_handler(thd, thd->main_da.sql_errno(),
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                                MYSQL_ERROR::WARN_LEVEL_ERROR))
  {
    /*
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      We're executing a stored procedure, have an open result
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      set, an SQL exception condition and a handler for it.
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      In this situation we must abort the current statement,
      silence the error and start executing the continue/exit
      handler.
      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->protocol->end_partial_result_set(thd);
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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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  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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    return 0;
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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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  List_iterator_fast<Item> li(items);
  Protocol *protocol= thd->protocol;
  char buff[MAX_FIELD_WIDTH];
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  String buffer(buff, sizeof(buff), &my_charset_bin);
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  DBUG_ENTER("select_send::send_data");
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  protocol->prepare_for_resend();
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  Item *item;
  while ((item=li++))
  {
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    if (item->send(protocol, &buffer))
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    {
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      protocol->free();				// Free used buffer
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
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      break;
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    }
  }
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  thd->sent_row_count++;
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  if (thd->is_error())
  {
    protocol->remove_last_row();
    DBUG_RETURN(1);
  }
  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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  /* Unlock tables before sending packet to gain some speed */
  if (thd->lock)
  {
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    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;
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  }
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  ::send_eof(thd);
  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);
    (void) my_close(file,MYF(0));
    (void) my_delete(path,MYF(0));		// Delete file on error
    file= -1;
  }
}
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bool select_to_file::send_eof()
{
  int error= test(end_io_cache(&cache));
  if (my_close(file,MYF(MY_WME)))
    error= 1;
  if (!error)
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  {
    /*
      In order to remember the value of affected rows for ROW_COUNT()
      function, SELECT INTO has to have an own SQLCOM.
      TODO: split from SQLCOM_SELECT
    */
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    ::send_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);
    (void) my_close(file,MYF(0));
    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);
    (void) my_close(file,MYF(0));
    file= -1;
  }
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}

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

select_export::~select_export()
{
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  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 (opt_secure_file_priv &&
      strncmp(opt_secure_file_priv, path, strlen(opt_secure_file_priv)))
  {
    /* 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;
  }

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  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= my_create(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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    my_close(file, MYF(0));
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    my_delete(path, MYF(0));  // Delete file on error, it was just created 
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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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  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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    }
  }
  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);
  escape_char=	(exchange->escaped->length() ?
                (int) (uchar) (*exchange->escaped)[0] : -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;
}


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#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)
{

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  DBUG_ENTER("select_export::send_data");
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  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
  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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  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();
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    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 && 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;
    }
    if (!res)
    {						// NULL
      if (!fixed_row_size)
      {
	if (escape_char != -1)			// Use \N syntax
	{
	  null_buff[0]=escape_char;
	  null_buff[1]='N';
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	  if (my_b_write(&cache,(uchar*) null_buff,2))
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	    goto err;
	}
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	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.
          */

1878 1879 1880 1881 1882 1883 1884 1885 1886
          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))
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          {
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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;
	  }
	}
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	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)
    {
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      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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1972
  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);
  }
  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);
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    if (!res)					// If NULL
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    {
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      if (my_b_write(&cache,(uchar*) "",1))
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	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);
}


2002
select_subselect::select_subselect(Item_subselect *item_arg)
2003
{
2004
  item= item_arg;
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}

2007

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bool select_singlerow_subselect::send_data(List<Item> &items)
2009
{
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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);
2028
}
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2030

2031 2032 2033 2034 2035 2036 2037 2038
void select_max_min_finder_subselect::cleanup()
{
  DBUG_ENTER("select_max_min_finder_subselect::cleanup");
  cache= 0;
  DBUG_VOID_RETURN;
}


2039 2040 2041
bool select_max_min_finder_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_max_min_finder_subselect::send_data");
2042
  Item_maxmin_subselect *it= (Item_maxmin_subselect *)item;
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  List_iterator_fast<Item> li(items);
  Item *val_item= li++;
2045
  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()
{
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  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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/***************************************************************************
2159
  Dump of select to variables
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***************************************************************************/
2161

2162
int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
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{
2164
  unit= u;
2165
  
2166
  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));
2170
    return 1;
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  }               
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  return 0;
}
2174

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


2183 2184
void select_dumpvar::cleanup()
{
2185
  row_count= 0;
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}


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Query_arena::Type Query_arena::type() const
2190
{
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  DBUG_ASSERT(0); /* Should never be called */
2192
  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()
{
  DBUG_ASSERT("Query_arena::cleanup_stmt()" == "not implemented");
}

2224
/*
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  Statement functions
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*/

2228 2229 2230
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),
2232
  mark_used_columns(MARK_COLUMNS_READ),
2233
  lex(lex_arg),
2234
  query(0),
2235
  query_length(0),
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  cursor(0),
  db(NULL),
  db_length(0)
2239
{
2240
  name.str= NULL;
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}


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Query_arena::Type Statement::type() const
2245 2246 2247 2248 2249 2250 2251 2252
{
  return STATEMENT;
}


void Statement::set_statement(Statement *stmt)
{
  id=             stmt->id;
2253
  mark_used_columns=   stmt->mark_used_columns;
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  lex=            stmt->lex;
  query=          stmt->query;
  query_length=   stmt->query_length;
2257
  cursor=         stmt->cursor;
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}


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void
Statement::set_n_backup_statement(Statement *stmt, Statement *backup)
{
2264
  DBUG_ENTER("Statement::set_n_backup_statement");
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  backup->set_statement(this);
  set_statement(stmt);
2267
  DBUG_VOID_RETURN;
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}


void Statement::restore_backup_statement(Statement *stmt, Statement *backup)
{
2273
  DBUG_ENTER("Statement::restore_backup_statement");
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  stmt->set_statement(this);
  set_statement(backup);
2276
  DBUG_VOID_RETURN;
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}


2280
void THD::end_statement()
2281
{
2282
  /* Cleanup SQL processing state to reuse this statement in next query. */
2283 2284 2285
  lex_end(lex);
  delete lex->result;
  lex->result= 0;
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  /* Note that free_list is freed in cleanup_after_query() */

2288 2289 2290 2291 2292 2293 2294
  /*
    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");
2298
  DBUG_ASSERT(backup->is_backup_arena == FALSE);
2299

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  backup->set_query_arena(this);
  set_query_arena(set);
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#ifndef DBUG_OFF
2303
  backup->is_backup_arena= TRUE;
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#endif
2305
  DBUG_VOID_RETURN;
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}


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void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
2310
{
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  DBUG_ENTER("THD::restore_active_arena");
2312
  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
2316
  backup->is_backup_arena= FALSE;
2317
#endif
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  DBUG_VOID_RETURN;
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}

2321 2322 2323 2324 2325 2326
Statement::~Statement()
{
}

C_MODE_START

2327 2328
static uchar *
get_statement_id_as_hash_key(const uchar *record, size_t *key_length,
2329 2330 2331 2332
                             my_bool not_used __attribute__((unused)))
{
  const Statement *statement= (const Statement *) record; 
  *key_length= sizeof(statement->id);
2333
  return (uchar *) &((const Statement *) statement)->id;
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}

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

2341
static uchar *get_stmt_name_hash_key(Statement *entry, size_t *length,
2342
                                    my_bool not_used __attribute__((unused)))
2343
{
2344 2345
  *length= entry->name.length;
  return (uchar*) entry->name.str;
2346 2347
}

2348 2349 2350 2351 2352
C_MODE_END

Statement_map::Statement_map() :
  last_found_statement(0)
{
2353 2354 2355 2356 2357
  enum
  {
    START_STMT_HASH_SIZE = 16,
    START_NAME_HASH_SIZE = 16
  };
2358
  hash_init(&st_hash, &my_charset_bin, START_STMT_HASH_SIZE, 0, 0,
2359 2360
            get_statement_id_as_hash_key,
            delete_statement_as_hash_key, MYF(0));
2361
  hash_init(&names_hash, system_charset_info, START_NAME_HASH_SIZE, 0, 0,
2362 2363
            (hash_get_key) get_stmt_name_hash_key,
            NULL,MYF(0));
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}

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2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
/*
  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)
2389
{
2390
  if (my_hash_insert(&st_hash, (uchar*) statement))
2391
  {
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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;
  }
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  if (statement->name.str && my_hash_insert(&names_hash, (uchar*) statement))
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  {
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    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_names_hash;
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  }
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  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  /*
    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)
  {
    pthread_mutex_unlock(&LOCK_prepared_stmt_count);
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    my_error(ER_MAX_PREPARED_STMT_COUNT_REACHED, MYF(0),
             max_prepared_stmt_count);
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    goto err_max;
  }
  prepared_stmt_count++;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

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  last_found_statement= statement;
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  return 0;

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

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void Statement_map::close_transient_cursors()
{
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#ifdef TO_BE_IMPLEMENTED
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  Statement *stmt;
  while ((stmt= transient_cursor_list.head()))
    stmt->close_cursor();                 /* deletes itself from the list */
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#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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    hash_delete(&names_hash, (uchar *) statement);
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  hash_delete(&st_hash, (uchar *) statement);
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  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count > 0);
  prepared_stmt_count--;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);
}


void Statement_map::reset()
{
  /* Must be first, hash_free will reset st_hash.records */
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

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

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Statement_map::~Statement_map()
{
  /* Must go first, hash_free will reset st_hash.records */
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

  hash_free(&names_hash);
  hash_free(&st_hash);
}

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bool select_dumpvar::send_data(List<Item> &items)
{
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  List_iterator_fast<my_var> var_li(var_list);
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  List_iterator<Item> it(items);
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  Item *item;
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  my_var *mv;
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  DBUG_ENTER("select_dumpvar::send_data");
2494

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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--;
    DBUG_RETURN(0);
  }
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  if (row_count++) 
  {
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    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
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    DBUG_RETURN(1);
  }
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  while ((mv= var_li++) && (item= it++))
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  {
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    if (mv->local)
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    {
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      if (thd->spcont->set_variable(thd, mv->offset, &item))
	    DBUG_RETURN(1);
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    }
    else
    {
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      Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
      suv->fix_fields(thd, 0);
      suv->check(0);
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      suv->update();
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    }
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  }
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  DBUG_RETURN(0);
}

bool select_dumpvar::send_eof()
{
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  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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  /*
    In order to remember the value of affected rows for ROW_COUNT()
    function, SELECT INTO has to have an own SQLCOM.
    TODO: split from SQLCOM_SELECT
  */
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  ::send_ok(thd,row_count);
  return 0;
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}
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/****************************************************************************
  TMP_TABLE_PARAM
****************************************************************************/

void TMP_TABLE_PARAM::init()
{
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  DBUG_ENTER("TMP_TABLE_PARAM::init");
  DBUG_PRINT("enter", ("this: 0x%lx", (ulong)this));
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  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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  table_charset= 0;
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  precomputed_group_by= 0;
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  DBUG_VOID_RETURN;
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}
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void thd_increment_bytes_sent(ulong length)
{
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  THD *thd=current_thd;
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  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));
}
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void Security_context::init()
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{
  host= user= priv_user= ip= 0;
  host_or_ip= "connecting host";
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  priv_host[0]= '\0';
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  master_access= 0;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  db_access= NO_ACCESS;
#endif
}


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void Security_context::destroy()
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{
  // If not pointer to constant
  if (host != my_localhost)
    safeFree(host);
  if (user != delayed_user)
    safeFree(user);
  safeFree(ip);
}


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void Security_context::skip_grants()
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{
  /* privileges for the user are unknown everything is allowed */
  host_or_ip= (char *)"";
  master_access= ~NO_ACCESS;
  priv_user= (char *)"";
  *priv_host= '\0';
}


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bool Security_context::set_user(char *user_arg)
{
  safeFree(user);
  user= my_strdup(user_arg, MYF(0));
  return user == 0;
}

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#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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  @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
  ultimately by means of acl_getroot_no_password), and make the
  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;
  /*
    The current security context may have NULL members
    if we have just started the thread and not authenticated
    any user. This use case is currently in events worker thread.
  */
  needs_change= (thd->security_ctx->priv_user == NULL ||
                 strcmp(definer_user->str, thd->security_ctx->priv_user) ||
                 thd->security_ctx->priv_host == NULL ||
                 my_strcasecmp(system_charset_info, definer_host->str,
                               thd->security_ctx->priv_host));
  if (needs_change)
  {
    if (acl_getroot_no_password(this, definer_user->str, definer_host->str,
                                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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/****************************************************************************
  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.
****************************************************************************/

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void THD::reset_n_backup_open_tables_state(Open_tables_state *backup)
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{
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  DBUG_ENTER("reset_n_backup_open_tables_state");
  backup->set_open_tables_state(this);
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  reset_open_tables_state();
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  state_flags|= Open_tables_state::BACKUPS_AVAIL;
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  DBUG_VOID_RETURN;
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}


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void THD::restore_backup_open_tables_state(Open_tables_state *backup)
{
  DBUG_ENTER("restore_backup_open_tables_state");
  /*
    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 &&
              handler_tables == 0 && derived_tables == 0 &&
              lock == 0 && locked_tables == 0 &&
              prelocked_mode == NON_PRELOCKED);
  set_open_tables_state(backup);
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  DBUG_VOID_RETURN;
}
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/**
  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);
}
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#ifdef INNODB_COMPATIBILITY_HOOKS
extern "C" struct charset_info_st *thd_charset(MYSQL_THD thd)
{
  return(thd->charset());
}

extern "C" char **thd_query(MYSQL_THD thd)
{
  return(&thd->query);
}

extern "C" int thd_slave_thread(const MYSQL_THD thd)
{
  return(thd->slave_thread);
}
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extern "C" int thd_non_transactional_update(const MYSQL_THD thd)
{
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  return(thd->transaction.all.modified_non_trans_table);
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}

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extern "C" int thd_binlog_format(const MYSQL_THD thd)
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{
  return (int) thd->variables.binlog_format;
}
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extern "C" void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all)
{
  mark_transaction_to_rollback(thd, all);
}
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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))
  {
    backup->auto_inc_intervals_forced= auto_inc_intervals_forced;
    auto_inc_intervals_forced.empty();
  }
#endif
  
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  backup->options=         options;
  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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2857
  if ((!lex->requires_prelocking() || is_update_query(lex->sql_command)) &&
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      !current_stmt_binlog_row_based)
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  {
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    options&= ~OPTION_BIN_LOG;
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  }
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  if ((backup->options & OPTION_BIN_LOG) && is_update_query(lex->sql_command)&&
      !current_stmt_binlog_row_based)
    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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#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))
  {
    auto_inc_intervals_forced= backup->auto_inc_intervals_forced;
    backup->auto_inc_intervals_forced.empty();
  }
#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);
  }
  transaction.savepoints= backup->savepoints;
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  options=          backup->options;
  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 ((options & OPTION_BIN_LOG) && is_update_query(lex->sql_command) &&
    !current_stmt_binlog_row_based)
    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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/**
  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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}
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/***************************************************************************
  Handling of XA id cacheing
***************************************************************************/

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pthread_mutex_t LOCK_xid_cache;
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((uchar*)ptr, MYF(0));
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}

bool xid_cache_init()
{
  pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
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  return 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()
{
  if (hash_inited(&xid_cache))
  {
    hash_free(&xid_cache);
    pthread_mutex_destroy(&LOCK_xid_cache);
  }
}

XID_STATE *xid_cache_search(XID *xid)
{
  pthread_mutex_lock(&LOCK_xid_cache);
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  XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
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  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

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bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
  XID_STATE *xs;
  my_bool res;
  pthread_mutex_lock(&LOCK_xid_cache);
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  if (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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    res=my_hash_insert(&xid_cache, (uchar*)xs);
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  }
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

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bool xid_cache_insert(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
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  DBUG_ASSERT(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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  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

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void xid_cache_delete(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
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  hash_delete(&xid_cache, (uchar *)xid_state);
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  pthread_mutex_unlock(&LOCK_xid_cache);
}

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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)))
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{
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  DBUG_ENTER("binlog_prepare_pending_rows_event");
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  /* Pre-conditions */
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  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())
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    DBUG_RETURN(NULL);
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  Rows_log_event* pending= binlog_get_pending_rows_event();

  if (unlikely(pending && !pending->is_valid()))
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    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...
    */
    if (unlikely(mysql_bin_log.flush_and_set_pending_rows_event(this, ev)))
    {
      delete ev;
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      DBUG_RETURN(NULL);
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    }

3131
    DBUG_RETURN(ev);               /* This is the new pending event */
3132
  }
3133
  DBUG_RETURN(pending);        /* This is the current pending event */
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}

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#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
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/*
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  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*,
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				       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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#ifdef NOT_USED
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static char const* 
field_type_name(enum_field_types type) 
{
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  switch (type) {
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  case MYSQL_TYPE_DECIMAL:
    return "MYSQL_TYPE_DECIMAL";
  case MYSQL_TYPE_TINY:
    return "MYSQL_TYPE_TINY";
  case MYSQL_TYPE_SHORT:
    return "MYSQL_TYPE_SHORT";
  case MYSQL_TYPE_LONG:
    return "MYSQL_TYPE_LONG";
  case MYSQL_TYPE_FLOAT:
    return "MYSQL_TYPE_FLOAT";
  case MYSQL_TYPE_DOUBLE:
    return "MYSQL_TYPE_DOUBLE";
  case MYSQL_TYPE_NULL:
    return "MYSQL_TYPE_NULL";
  case MYSQL_TYPE_TIMESTAMP:
    return "MYSQL_TYPE_TIMESTAMP";
  case MYSQL_TYPE_LONGLONG:
    return "MYSQL_TYPE_LONGLONG";
  case MYSQL_TYPE_INT24:
    return "MYSQL_TYPE_INT24";
  case MYSQL_TYPE_DATE:
    return "MYSQL_TYPE_DATE";
  case MYSQL_TYPE_TIME:
    return "MYSQL_TYPE_TIME";
  case MYSQL_TYPE_DATETIME:
    return "MYSQL_TYPE_DATETIME";
  case MYSQL_TYPE_YEAR:
    return "MYSQL_TYPE_YEAR";
  case MYSQL_TYPE_NEWDATE:
    return "MYSQL_TYPE_NEWDATE";
  case MYSQL_TYPE_VARCHAR:
    return "MYSQL_TYPE_VARCHAR";
  case MYSQL_TYPE_BIT:
    return "MYSQL_TYPE_BIT";
  case MYSQL_TYPE_NEWDECIMAL:
    return "MYSQL_TYPE_NEWDECIMAL";
  case MYSQL_TYPE_ENUM:
    return "MYSQL_TYPE_ENUM";
  case MYSQL_TYPE_SET:
    return "MYSQL_TYPE_SET";
  case MYSQL_TYPE_TINY_BLOB:
    return "MYSQL_TYPE_TINY_BLOB";
  case MYSQL_TYPE_MEDIUM_BLOB:
    return "MYSQL_TYPE_MEDIUM_BLOB";
  case MYSQL_TYPE_LONG_BLOB:
    return "MYSQL_TYPE_LONG_BLOB";
  case MYSQL_TYPE_BLOB:
    return "MYSQL_TYPE_BLOB";
  case MYSQL_TYPE_VAR_STRING:
    return "MYSQL_TYPE_VAR_STRING";
  case MYSQL_TYPE_STRING:
    return "MYSQL_TYPE_STRING";
  case MYSQL_TYPE_GEOMETRY:
    return "MYSQL_TYPE_GEOMETRY";
  }
  return "Unknown";
}
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#endif
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namespace {
  /**
     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.
     */
3250
    Row_data_memory(TABLE *table, size_t const len1)
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      : m_memory(0)
    {
#ifndef DBUG_OFF
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      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;
    }

3261
    Row_data_memory(TABLE *table, size_t const len1, size_t const len2)
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      : m_memory(0)
    {
#ifndef DBUG_OFF
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      m_alloc_checked= FALSE;
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#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)
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        my_free((uchar*) m_memory, MYF(MY_WME));
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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
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      m_alloc_checked= TRUE;
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#endif
      return m_memory != 0;
    }

3291
    uchar *slot(uint s)
3292
    {
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      DBUG_ASSERT(s < sizeof(m_ptr)/sizeof(*m_ptr));
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      DBUG_ASSERT(m_ptr[s] != 0);
3295
      DBUG_ASSERT(m_alloc_checked == TRUE);
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      return m_ptr[s];
    }

  private:
3300
    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.
        */
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        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=
3323
            (uchar *) alloc_root(&table->mem_root, 2 * maxlen);
3324
        m_memory= table->write_row_record;
3325
        m_release_memory_on_destruction= FALSE;
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      }
      else
      {
3329
        m_memory= (uchar *) my_malloc(total_length, MYF(MY_WME));
3330
        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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  };
}


3344
int THD::binlog_write_row(TABLE* table, bool is_trans, 
3345 3346
                          MY_BITMAP const* cols, size_t colcnt, 
                          uchar const *record) 
3347
{ 
3348
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
3349

3350 3351 3352
  /*
    Pack records into format for transfer. We are allocating more
    memory than needed, but that doesn't matter.
3353
  */
3354 3355 3356
  Row_data_memory memory(table, max_row_length(table, record));
  if (!memory.has_memory())
    return HA_ERR_OUT_OF_MEM;
3357

3358
  uchar *row_data= memory.slot(0);
3359

3360
  size_t const len= pack_row(table, cols, row_data, record);
3361

3362 3363 3364 3365 3366 3367 3368 3369 3370
  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);
3371 3372 3373
}

int THD::binlog_update_row(TABLE* table, bool is_trans,
3374 3375 3376
                           MY_BITMAP const* cols, size_t colcnt,
                           const uchar *before_record,
                           const uchar *after_record)
3377
{ 
3378
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
3379

3380 3381
  size_t const before_maxlen = max_row_length(table, before_record);
  size_t const after_maxlen  = max_row_length(table, after_record);
3382

3383 3384 3385 3386
  Row_data_memory row_data(table, before_maxlen, after_maxlen);
  if (!row_data.has_memory())
    return HA_ERR_OUT_OF_MEM;

3387 3388
  uchar *before_row= row_data.slot(0);
  uchar *after_row= row_data.slot(1);
3389

3390
  size_t const before_size= pack_row(table, cols, before_row,
3391
                                        before_record);
3392
  size_t const after_size= pack_row(table, cols, after_row,
3393
                                       after_record);
3394 3395 3396 3397 3398 3399

  /*
    Don't print debug messages when running valgrind since they can
    trigger false warnings.
   */
#ifndef HAVE_purify
3400 3401 3402 3403
  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);
3404
#endif
3405

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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));
3410

3411 3412 3413 3414
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return
3415
    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, 
3420 3421
                           MY_BITMAP const* cols, size_t colcnt,
                           uchar const *record)
3422
{ 
3423
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
3424 3425 3426 3427 3428

  /* 
     Pack records into format for transfer. We are allocating more
     memory than needed, but that doesn't matter.
  */
3429 3430
  Row_data_memory memory(table, max_row_length(table, record));
  if (unlikely(!memory.has_memory()))
3431
    return HA_ERR_OUT_OF_MEM;
3432

3433
  uchar *row_data= memory.slot(0);
3434

3435
  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));
3441

3442 3443
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;
3444

3445
  return ev->add_row_data(row_data, len);
3446 3447 3448 3449 3450 3451
}


int THD::binlog_flush_pending_rows_event(bool stmt_end)
{
  DBUG_ENTER("THD::binlog_flush_pending_rows_event");
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  /*
    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())
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    DBUG_RETURN(0);

  /*
    Mark the event as the last event of a statement if the stmt_end
    flag is set.
  */
  int error= 0;
  if (Rows_log_event *pending= binlog_get_pending_rows_event())
  {
    if (stmt_end)
    {
      pending->set_flags(Rows_log_event::STMT_END_F);
      pending->flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
3471
      binlog_table_maps= 0;
3472 3473
    }

3474 3475
    error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0);
  }
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  DBUG_RETURN(error);
}


/*
  Member function that will log query, either row-based or
3483 3484
  statement-based depending on the value of the 'current_stmt_binlog_row_based'
  the value of the 'qtype' flag.
3485 3486 3487 3488 3489

  This function should be called after the all calls to ha_*_row()
  functions have been issued, but before tables are unlocked and
  closed.

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  OBSERVE
    There shall be no writes to any system table after calling
    binlog_query(), so these writes has to be moved to before the call
    of binlog_query() for correct functioning.

    This is necessesary not only for RBR, but the master might crash
    after binlogging the query but before changing the system tables.
    This means that the slave and the master are not in the same state
    (after the master has restarted), so therefore we have to
    eliminate this problem.

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  RETURN VALUE
    Error code, or 0 if no error.
*/
3504
int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
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                      ulong query_len, bool is_trans, bool suppress_use,
                      THD::killed_state killed_status_arg)
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{
  DBUG_ENTER("THD::binlog_query");
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  DBUG_PRINT("enter", ("qtype: %d  query: '%s'", qtype, query_arg));
  DBUG_ASSERT(query_arg && mysql_bin_log.is_open());
3511

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  /*
    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().
  */
  if (this->prelocked_mode == NON_PRELOCKED)
    if (int error= binlog_flush_pending_rows_event(TRUE))
      DBUG_RETURN(error);

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  /*
    If we are in statement mode and trying to log an unsafe statement,
    we should print a warning.
  */
  if (lex->is_stmt_unsafe() &&
      variables.binlog_format == BINLOG_FORMAT_STMT)
  {
    DBUG_ASSERT(this->query != NULL);
    push_warning(this, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_BINLOG_UNSAFE_STATEMENT,
                 ER(ER_BINLOG_UNSAFE_STATEMENT));
    if (!(binlog_flags & BINLOG_FLAG_UNSAFE_STMT_PRINTED))
    {
      char warn_buf[MYSQL_ERRMSG_SIZE];
      my_snprintf(warn_buf, MYSQL_ERRMSG_SIZE, "%s Statement: %s",
                  ER(ER_BINLOG_UNSAFE_STATEMENT), this->query);
      sql_print_warning(warn_buf);
      binlog_flags|= BINLOG_FLAG_UNSAFE_STMT_PRINTED;
    }
  }

3546
  switch (qtype) {
3547 3548 3549 3550
  case THD::ROW_QUERY_TYPE:
    if (current_stmt_binlog_row_based)
      DBUG_RETURN(0);
    /* Otherwise, we fall through */
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  case THD::MYSQL_QUERY_TYPE:
    /*
      Using this query type is a conveniece hack, since we have been
      moving back and forth between using RBR for replication of
      system tables and not using it.

3557
      Make sure to change in check_table_binlog_row_based() according
3558 3559 3560 3561
      to how you treat this.
    */
  case THD::STMT_QUERY_TYPE:
    /*
3562 3563
      The MYSQL_LOG::write() function will set the STMT_END_F flag and
      flush the pending rows event if necessary.
3564 3565
     */
    {
3566
      Query_log_event qinfo(this, query_arg, query_len, is_trans, suppress_use,
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                            killed_status_arg);
3568
      qinfo.flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
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      /*
        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);
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    }
    break;

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

3588 3589 3590 3591 3592 3593 3594 3595 3596
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);
3597
    DBUG_RETURN(append(new_interval));
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  }
  DBUG_RETURN(0);
}

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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);
}

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#endif /* !defined(MYSQL_CLIENT) */