item_func.cc 122 KB
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/* Copyright (C) 2000-2003 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   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.

   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 defines all numerical functions */

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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 "slave.h"				// for wait_for_master_pos
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#include <m_ctype.h>
#include <hash.h>
#include <time.h>
#include <ft_global.h>

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#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
#define sp_restore_security_context(A,B) while (0) {}
#endif


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bool check_reserved_words(LEX_STRING *name)
{
  if (!my_strcasecmp(system_charset_info, name->str, "GLOBAL") ||
      !my_strcasecmp(system_charset_info, name->str, "LOCAL") ||
      !my_strcasecmp(system_charset_info, name->str, "SESSION"))
    return TRUE;
  return FALSE;
}


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/* return TRUE if item is a constant */

bool
eval_const_cond(COND *cond)
{
  return ((Item_func*) cond)->val_int() ? TRUE : FALSE;
}

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void Item_func::set_arguments(List<Item> &list)
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{
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  allowed_arg_cols= 1;
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  arg_count=list.elements;
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  args= tmp_arg;                                // If 2 arguments
  if (arg_count <= 2 || (args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
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  {
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    List_iterator_fast<Item> li(list);
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    Item *item;
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    Item **save_args= args;
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    while ((item=li++))
    {
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      *(save_args++)= item;
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      with_sum_func|=item->with_sum_func;
    }
  }
  list.empty();					// Fields are used
}

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Item_func::Item_func(List<Item> &list)
  :allowed_arg_cols(1)
{
  set_arguments(list);
}

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Item_func::Item_func(THD *thd, Item_func *item)
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  :Item_result_field(thd, item),
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   allowed_arg_cols(item->allowed_arg_cols),
   arg_count(item->arg_count),
   used_tables_cache(item->used_tables_cache),
   not_null_tables_cache(item->not_null_tables_cache),
   const_item_cache(item->const_item_cache)
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{
  if (arg_count)
  {
    if (arg_count <=2)
      args= tmp_arg;
    else
    {
      if (!(args=(Item**) thd->alloc(sizeof(Item*)*arg_count)))
	return;
    }
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    memcpy((char*) args, (char*) item->args, sizeof(Item*)*arg_count);
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  }
}

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/*
  Resolve references to table column for a function and it's argument

  SYNOPSIS:
  fix_fields()
  thd		Thread object
  ref		Pointer to where this object is used.  This reference
		is used if we want to replace this object with another
		one (for example in the summary functions).

  DESCRIPTION
    Call fix_fields() for all arguments to the function.  The main intention
    is to allow all Item_field() objects to setup pointers to the table fields.

    Sets as a side effect the following class variables:
      maybe_null	Set if any argument may return NULL
      with_sum_func	Set if any of the arguments contains a sum function
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      used_tables_cache Set to union of the tables used by arguments
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      str_value.charset If this is a string function, set this to the
			character set for the first argument.
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			If any argument is binary, this is set to binary
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   If for any item any of the defaults are wrong, then this can
   be fixed in the fix_length_and_dec() function that is called
   after this one or by writing a specialized fix_fields() for the
   item.

  RETURN VALUES
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  FALSE	ok
  TRUE	Got error.  Stored with my_error().
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*/

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bool
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Item_func::fix_fields(THD *thd, Item **ref)
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{
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  DBUG_ASSERT(fixed == 0);
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  Item **arg,**arg_end;
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#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
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  used_tables_cache= not_null_tables_cache= 0;
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  const_item_cache=1;

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  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
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    return TRUE;				// Fatal error if flag is set!
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  if (arg_count)
  {						// Print purify happy
    for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
    {
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      Item *item;
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      /*
	We can't yet set item to *arg as fix_fields may change *arg
	We shouldn't call fix_fields() twice, so check 'fixed' field first
      */
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      if ((!(*arg)->fixed && (*arg)->fix_fields(thd, arg)))
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	return TRUE;				/* purecov: inspected */
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      item= *arg;
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      if (allowed_arg_cols)
      {
        if (item->check_cols(allowed_arg_cols))
          return 1;
      }
      else
      {
        /*  we have to fetch allowed_arg_cols from first argument */
        DBUG_ASSERT(arg == args); // it is first argument
        allowed_arg_cols= item->cols();
        DBUG_ASSERT(allowed_arg_cols); // Can't be 0 any more
      }

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      if (item->maybe_null)
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	maybe_null=1;
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      with_sum_func= with_sum_func || item->with_sum_func;
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      used_tables_cache|=     item->used_tables();
      not_null_tables_cache|= item->not_null_tables();
      const_item_cache&=      item->const_item();
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      with_subselect|=        item->with_subselect;
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    }
  }
  fix_length_and_dec();
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  if (thd->net.report_error) // An error inside fix_length_and_dec occured
    return TRUE;
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  fixed= 1;
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  return FALSE;
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}

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bool Item_func::walk (Item_processor processor, byte *argument)
{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
      if ((*arg)->walk(processor, argument))
	return 1;
    }
  }
  return (this->*processor)(argument);
}
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void Item_func::traverse_cond(Cond_traverser traverser,
                              void *argument, traverse_order order)
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{
  if (arg_count)
  {
    Item **arg,**arg_end;
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    switch (order) {
    case(PREFIX):
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      (*traverser)(this, argument);
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      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
      break;
    case (POSTFIX):
      for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      {
	(*arg)->traverse_cond(traverser, argument, order);
      }
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      (*traverser)(this, argument);
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    }
  }
}

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/*
  Transform an Item_func object with a transformer callback function
   
  SYNOPSIS
    transform()
    transformer   the transformer callback function to be applied to the nodes
                  of the tree of the object
    argument      parameter to be passed to the transformer
  
  DESCRIPTION
    The function recursively applies the transform method with the
    same transformer to each argument the function.
    If the call of the method for a member item returns a new item
    the old item is substituted for a new one.
    After this the transform method is applied to the root node
    of the Item_func object. 
     
  RETURN VALUES
    Item returned as the result of transformation of the root node 
*/

Item *Item_func::transform(Item_transformer transformer, byte *argument)
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{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
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      Item *new_item= (*arg)->transform(transformer, argument);
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      if (!new_item)
	return 0;
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      if (*arg != new_item)
        current_thd->change_item_tree(arg, new_item);
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    }
  }
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  return (this->*transformer)(argument);
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}


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/* See comments in Item_cmp_func::split_sum_func() */

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void Item_func::split_sum_func(THD *thd, Item **ref_pointer_array,
                               List<Item> &fields)
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{
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  Item **arg, **arg_end;
  for (arg= args, arg_end= args+arg_count; arg != arg_end ; arg++)
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    (*arg)->split_sum_func2(thd, ref_pointer_array, fields, arg, TRUE);
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}


void Item_func::update_used_tables()
{
  used_tables_cache=0;
  const_item_cache=1;
  for (uint i=0 ; i < arg_count ; i++)
  {
    args[i]->update_used_tables();
    used_tables_cache|=args[i]->used_tables();
    const_item_cache&=args[i]->const_item();
  }
}


table_map Item_func::used_tables() const
{
  return used_tables_cache;
}

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table_map Item_func::not_null_tables() const
{
  return not_null_tables_cache;
}


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void Item_func::print(String *str)
{
  str->append(func_name());
  str->append('(');
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  print_args(str, 0);
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  str->append(')');
}


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void Item_func::print_args(String *str, uint from)
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{
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  for (uint i=from ; i < arg_count ; i++)
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  {
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    if (i != from)
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      str->append(',');
    args[i]->print(str);
  }
}


void Item_func::print_op(String *str)
{
  str->append('(');
  for (uint i=0 ; i < arg_count-1 ; i++)
  {
    args[i]->print(str);
    str->append(' ');
    str->append(func_name());
    str->append(' ');
  }
  args[arg_count-1]->print(str);
  str->append(')');
}

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bool Item_func::eq(const Item *item, bool binary_cmp) const
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{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;
  if (item->type() != FUNC_ITEM)
    return 0;
  Item_func *item_func=(Item_func*) item;
  if (arg_count != item_func->arg_count ||
      func_name() != item_func->func_name())
    return 0;
  for (uint i=0; i < arg_count ; i++)
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    if (!args[i]->eq(item_func->args[i], binary_cmp))
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      return 0;
  return 1;
}

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Field *Item_func::tmp_table_field(TABLE *t_arg)
{
  Field *res;
  LINT_INIT(res);

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  switch (result_type()) {
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  case INT_RESULT:
    if (max_length > 11)
      res= new Field_longlong(max_length, maybe_null, name, t_arg,
			      unsigned_flag);
    else
      res= new Field_long(max_length, maybe_null, name, t_arg,
			  unsigned_flag);
    break;
  case REAL_RESULT:
    res= new Field_double(max_length, maybe_null, name, t_arg, decimals);
    break;
  case STRING_RESULT:
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    res= make_string_field(t_arg);
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    break;
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  case DECIMAL_RESULT:
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    res= new Field_new_decimal(my_decimal_precision_to_length(decimal_precision(),
                                                              decimals,
                                                              unsigned_flag),
                               maybe_null, name, t_arg, decimals, unsigned_flag);
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    break;
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  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    break;
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  }
  return res;
}

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my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  int2my_decimal(E_DEC_FATAL_ERROR, val_int(), unsigned_flag, decimal_value);
  return decimal_value;
}

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String *Item_real_func::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  double nr= val_real();
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  if (null_value)
    return 0; /* purecov: inspected */
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  str->set(nr,decimals, &my_charset_bin);
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  return str;
}


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my_decimal *Item_real_func::val_decimal(my_decimal *decimal_value)
{
  DBUG_ASSERT(fixed);
  double nr= val_real();
  if (null_value)
    return 0; /* purecov: inspected */
  double2my_decimal(E_DEC_FATAL_ERROR, nr, decimal_value);
  return decimal_value;
}


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void Item_func::fix_num_length_and_dec()
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{
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  uint fl_length= 0;
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  decimals=0;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
    set_if_bigger(decimals,args[i]->decimals);
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    set_if_bigger(fl_length, args[i]->max_length);
  }
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  max_length=float_length(decimals);
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  if (fl_length > max_length)
  {
    decimals= NOT_FIXED_DEC;
    max_length= float_length(NOT_FIXED_DEC);
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  }
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}


void Item_func_numhybrid::fix_num_length_and_dec()
{}


/*
  Set max_length/decimals of function if function is fixed point and
  result length/precision depends on argument ones

  SYNOPSIS
    Item_func::count_decimal_length()
*/

void Item_func::count_decimal_length()
{
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  int max_int_part= 0;
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  decimals= 0;
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  unsigned_flag= 1;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    set_if_bigger(decimals, args[i]->decimals);
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    set_if_bigger(max_int_part, args[i]->decimal_int_part());
    set_if_smaller(unsigned_flag, args[i]->unsigned_flag);
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  }
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  int precision= min(max_int_part + decimals, DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}


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/*
  Set max_length of if it is maximum length of its arguments

  SYNOPSIS
    Item_func::count_only_length()
*/

void Item_func::count_only_length()
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{
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  max_length= 0;
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  unsigned_flag= 0;
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  for (uint i=0 ; i < arg_count ; i++)
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  {
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    set_if_bigger(max_length, args[i]->max_length);
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    set_if_bigger(unsigned_flag, args[i]->unsigned_flag);
  }
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}

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/*
  Set max_length/decimals of function if function is floating point and
  result length/precision depends on argument ones

  SYNOPSIS
    Item_func::count_real_length()
*/

void Item_func::count_real_length()
{
  uint32 length= 0;
  decimals= 0;
  max_length= 0;
  for (uint i=0 ; i < arg_count ; i++)
  {
    if (decimals != NOT_FIXED_DEC)
    {
      set_if_bigger(decimals, args[i]->decimals);
      set_if_bigger(length, (args[i]->max_length - args[i]->decimals));
    }
    set_if_bigger(max_length, args[i]->max_length);
  }
  if (decimals != NOT_FIXED_DEC)
  {
    max_length= length;
    length+= decimals;
    if (length < max_length)  // If previous operation gave overflow
      max_length= UINT_MAX32;
    else
      max_length= length;
  }
}



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void Item_func::signal_divide_by_null()
{
  THD *thd= current_thd;
  if (thd->variables.sql_mode & MODE_ERROR_FOR_DIVISION_BY_ZERO)
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_DIVISION_BY_ZERO,
                 ER(ER_DIVISION_BY_ZERO));
  null_value= 1;
}


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Item *Item_func::get_tmp_table_item(THD *thd)
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{
  if (!with_sum_func && !const_item())
    return new Item_field(result_field);
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  return copy_or_same(thd);
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}

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String *Item_int_func::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  longlong nr=val_int();
  if (null_value)
    return 0;
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  if (!unsigned_flag)
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    str->set(nr,&my_charset_bin);
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  else
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    str->set((ulonglong) nr,&my_charset_bin);
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  return str;
}

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void Item_func_connection_id::fix_length_and_dec()
{
  Item_int_func::fix_length_and_dec();
  max_length= 10;
}


bool Item_func_connection_id::fix_fields(THD *thd, Item **ref)
{
  if (Item_int_func::fix_fields(thd, ref))
    return TRUE;

  /*
    To replicate CONNECTION_ID() properly we should use
    pseudo_thread_id on slave, which contains the value of thread_id
    on master.
  */
  value= ((thd->slave_thread) ?
          thd->variables.pseudo_thread_id :
          thd->thread_id);

  return FALSE;
}


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/*
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  Check arguments here to determine result's type for a numeric
  function of two arguments.
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  SYNOPSIS
    Item_num_op::find_num_type()
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*/
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void Item_num_op::find_num_type(void)
{
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  DBUG_ENTER("Item_num_op::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
  DBUG_ASSERT(arg_count == 2);
  Item_result r0= args[0]->result_type();
  Item_result r1= args[1]->result_type();

  if (r0 == REAL_RESULT || r1 == REAL_RESULT ||
      r0 == STRING_RESULT || r1 ==STRING_RESULT)
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  {
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    count_real_length();
    max_length= float_length(decimals);
    hybrid_type= REAL_RESULT;
  }
  else if (r0 == DECIMAL_RESULT || r1 == DECIMAL_RESULT)
  {
    hybrid_type= DECIMAL_RESULT;
    result_precision();
  }
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  else
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  {
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    DBUG_ASSERT(r0 == INT_RESULT && r1 == INT_RESULT);
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    decimals= 0;
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    hybrid_type=INT_RESULT;
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    result_precision();
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  }
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  DBUG_PRINT("info", ("Type: %s",
             (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
              hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
              hybrid_type == INT_RESULT ? "INT_RESULT" :
              "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
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}

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/*
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  Set result type for a numeric function of one argument
  (can be also used by a numeric function of many arguments, if the result
  type depends only on the first argument)
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  SYNOPSIS
    Item_func_num1::find_num_type()
*/
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void Item_func_num1::find_num_type()
{
  DBUG_ENTER("Item_func_num1::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
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  switch (hybrid_type= args[0]->result_type()) {
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  case INT_RESULT:
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    unsigned_flag= args[0]->unsigned_flag;
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    break;
  case STRING_RESULT:
  case REAL_RESULT:
    hybrid_type= REAL_RESULT;
    max_length= float_length(decimals);
    break;
  case DECIMAL_RESULT:
    break;
  default:
    DBUG_ASSERT(0);
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  }
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  DBUG_PRINT("info", ("Type: %s",
                      (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
                       hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
                       hybrid_type == INT_RESULT ? "INT_RESULT" :
                       "--ILLEGAL!!!--")));
  DBUG_VOID_RETURN;
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}

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void Item_func_num1::fix_num_length_and_dec()
{
  decimals= args[0]->decimals;
  max_length= args[0]->max_length;
}


void Item_func_numhybrid::fix_length_and_dec()
{
  fix_num_length_and_dec();
  find_num_type();
}


String *Item_func_numhybrid::val_str(String *str)
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{
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  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
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      return 0;                                 // null is set
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    my_decimal_round(E_DEC_FATAL_ERROR, val, decimals, FALSE, val);
    my_decimal2string(E_DEC_FATAL_ERROR, val, 0, 0, 0, str);
    break;
  }
  case INT_RESULT:
  {
    longlong nr= int_op();
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    if (null_value)
      return 0; /* purecov: inspected */
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    if (!unsigned_flag)
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      str->set(nr,&my_charset_bin);
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    else
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      str->set((ulonglong) nr,&my_charset_bin);
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    break;
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  }
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  case REAL_RESULT:
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  {
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    double nr= real_op();
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    if (null_value)
      return 0; /* purecov: inspected */
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    str->set(nr,decimals,&my_charset_bin);
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    break;
  }
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  case STRING_RESULT:
    return str_op(&str_value);
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  default:
    DBUG_ASSERT(0);
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  }
  return str;
}


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double Item_func_numhybrid::val_real()
{
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    double result;
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    if (!(val= decimal_op(&decimal_value)))
      return 0.0;                               // null is set
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    my_decimal2double(E_DEC_FATAL_ERROR, val, &result);
    return result;
  }
  case INT_RESULT:
    return (double)int_op();
  case REAL_RESULT:
    return real_op();
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  case STRING_RESULT:
  {
    char *end_not_used;
    int err_not_used;
    String *res= str_op(&str_value);
    return (res ? my_strntod(res->charset(), (char*) res->ptr(), res->length(),
			     &end_not_used, &err_not_used) : 0.0);
  }
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  default:
    DBUG_ASSERT(0);
  }
  return 0.0;
}


longlong Item_func_numhybrid::val_int()
{
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
  {
    my_decimal decimal_value, *val;
    if (!(val= decimal_op(&decimal_value)))
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      return 0;                                 // null is set
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    longlong result;
    my_decimal2int(E_DEC_FATAL_ERROR, val, unsigned_flag, &result);
    return result;
  }
  case INT_RESULT:
    return int_op();
  case REAL_RESULT:
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    return (longlong) rint(real_op());
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  case STRING_RESULT:
  {
    int err_not_used;
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    String *res;
    if (!(res= str_op(&str_value)))
      return 0;

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    char *end= (char*) res->ptr() + res->length();
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    CHARSET_INFO *cs= str_value.charset();
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    return (*(cs->cset->strtoll10))(cs, res->ptr(), &end, &err_not_used);
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  }
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  default:
    DBUG_ASSERT(0);
  }
  return 0;
}


my_decimal *Item_func_numhybrid::val_decimal(my_decimal *decimal_value)
{
  my_decimal *val= decimal_value;
  DBUG_ASSERT(fixed == 1);
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  switch (hybrid_type) {
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  case DECIMAL_RESULT:
    val= decimal_op(decimal_value);
    break;
  case INT_RESULT:
  {
    longlong result= int_op();
    int2my_decimal(E_DEC_FATAL_ERROR, result, unsigned_flag, decimal_value);
    break;
  }
  case REAL_RESULT:
  {
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    double result= (double)real_op();
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    double2my_decimal(E_DEC_FATAL_ERROR, result, decimal_value);
    break;
  }
  case STRING_RESULT:
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  {
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    String *res;
    if (!(res= str_op(&str_value)))
      return NULL;

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    str2my_decimal(E_DEC_FATAL_ERROR, (char*) res->ptr(),
                   res->length(), res->charset(), decimal_value);
    break;
  }  
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  case ROW_RESULT:
  default:
    DBUG_ASSERT(0);
  }
  return val;
}


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void Item_func_signed::print(String *str)
{
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  str->append(STRING_WITH_LEN("cast("));
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  args[0]->print(str);
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  str->append(STRING_WITH_LEN(" as signed)"));
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}


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longlong Item_func_signed::val_int_from_str(int *error)
{
  char buff[MAX_FIELD_WIDTH], *end;
  String tmp(buff,sizeof(buff), &my_charset_bin), *res;
  longlong value;

  /*
    For a string result, we must first get the string and then convert it
    to a longlong
  */

  if (!(res= args[0]->val_str(&tmp)))
  {
    null_value= 1;
    *error= 0;
    return 0;
  }
  null_value= 0;
  end= (char*) res->ptr()+ res->length();
  value= my_strtoll10(res->ptr(), &end, error);
  if (*error > 0 || end != res->ptr()+ res->length())
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_TRUNCATED_WRONG_VALUE,
                        ER(ER_TRUNCATED_WRONG_VALUE), "INTEGER",
                        res->c_ptr());
  return value;
}


longlong Item_func_signed::val_int()
{
  longlong value;
  int error;

  if (args[0]->cast_to_int_type() != STRING_RESULT)
  {
    value= args[0]->val_int();
    null_value= args[0]->null_value; 
    return value;
  }

  value= val_int_from_str(&error);
  if (value < 0 && error == 0)
  {
    push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
                 "Cast to signed converted positive out-of-range integer to "
                 "it's negative complement");
  }
  return value;
}


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void Item_func_unsigned::print(String *str)
{
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  str->append(STRING_WITH_LEN("cast("));
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  args[0]->print(str);
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  str->append(STRING_WITH_LEN(" as unsigned)"));
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}


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longlong Item_func_unsigned::val_int()
{
  longlong value;
  int error;

  if (args[0]->cast_to_int_type() != STRING_RESULT)
  {
    value= args[0]->val_int();
    null_value= args[0]->null_value; 
    return value;
  }

  value= val_int_from_str(&error);
  if (error < 0)
    push_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
                 "Cast to unsigned converted negative integer to it's "
                 "positive complement");
  return value;
}


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String *Item_decimal_typecast::val_str(String *str)
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
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  if (null_value)
    return NULL;
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  my_decimal2string(E_DEC_FATAL_ERROR, tmp, 0, 0, 0, str);
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  return str;
}


double Item_decimal_typecast::val_real()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  double res;
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  if (null_value)
    return 0.0;
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  my_decimal2double(E_DEC_FATAL_ERROR, tmp, &res);
  return res;
}


longlong Item_decimal_typecast::val_int()
{
  my_decimal tmp_buf, *tmp= val_decimal(&tmp_buf);
  longlong res;
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  if (null_value)
    return 0;
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  my_decimal2int(E_DEC_FATAL_ERROR, tmp, unsigned_flag, &res);
  return res;
}


my_decimal *Item_decimal_typecast::val_decimal(my_decimal *dec)
{
  my_decimal tmp_buf, *tmp= args[0]->val_decimal(&tmp_buf);
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  if ((null_value= args[0]->null_value))
    return NULL;
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  my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, dec);
  return dec;
}


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void Item_decimal_typecast::print(String *str)
{
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  str->append(STRING_WITH_LEN("cast("));
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  args[0]->print(str);
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  str->append(STRING_WITH_LEN(" as decimal)"));
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}


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double Item_func_plus::real_op()
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{
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  double value= args[0]->val_real() + args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

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longlong Item_func_plus::int_op()
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{
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  longlong value=args[0]->val_int()+args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
}


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/*
  Calculate plus of two decimail's

  SYNOPSIS
    decimal_op()
    decimal_value	Buffer that can be used to store result

  RETURN
   0	Value was NULL;  In this case null_value is set
   #	Value of operation as a decimal
*/

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my_decimal *Item_func_plus::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
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                     (my_decimal_add(E_DEC_FATAL_ERROR, decimal_value, val1,
                                     val2) > 3))))
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    return decimal_value;
  return 0;
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}

/*
  Set precision of results for additive operations (+ and -)

  SYNOPSIS
    Item_func_additive_op::result_precision()
*/
void Item_func_additive_op::result_precision()
{
  decimals= max(args[0]->decimals, args[1]->decimals);
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  int max_int_part= max(args[0]->decimal_precision() - args[0]->decimals,
                        args[1]->decimal_precision() - args[1]->decimals);
  int precision= min(max_int_part + 1 + decimals, DECIMAL_MAX_PRECISION);

  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}

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/*
  The following function is here to allow the user to force
  subtraction of UNSIGNED BIGINT to return negative values.
*/

void Item_func_minus::fix_length_and_dec()
{
  Item_num_op::fix_length_and_dec();
  if (unsigned_flag &&
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      (current_thd->variables.sql_mode & MODE_NO_UNSIGNED_SUBTRACTION))
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    unsigned_flag=0;
}


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double Item_func_minus::real_op()
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{
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  double value= args[0]->val_real() - args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

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longlong Item_func_minus::int_op()
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{
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  longlong value=args[0]->val_int() - args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
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}

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/* See Item_func_plus::decimal_op for comments */

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my_decimal *Item_func_minus::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2= 

  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
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                     (my_decimal_sub(E_DEC_FATAL_ERROR, decimal_value, val1,
                                     val2) > 3))))
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    return decimal_value;
  return 0;
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}

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double Item_func_mul::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real() * args[1]->val_real();
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  if ((null_value=args[0]->null_value || args[1]->null_value))
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    return 0.0;
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  return value;
}

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longlong Item_func_mul::int_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=args[0]->val_int()*args[1]->val_int();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0;
  return value;
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}


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/* See Item_func_plus::decimal_op for comments */

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my_decimal *Item_func_mul::decimal_op(my_decimal *decimal_value)
{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;
  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if (!(null_value= (args[1]->null_value ||
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                     (my_decimal_mul(E_DEC_FATAL_ERROR, decimal_value, val1,
                                    val2) > 3))))
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    return decimal_value;
  return 0;
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}


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void Item_func_mul::result_precision()
{
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  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + args[1]->decimals, DECIMAL_MAX_SCALE);
  int precision= min(args[0]->decimal_precision() + args[1]->decimal_precision(),
                     DECIMAL_MAX_PRECISION);
  max_length= my_decimal_precision_to_length(precision, decimals,unsigned_flag);
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}


double Item_func_div::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2= args[1]->val_real();
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  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0.0;
  if (val2 == 0.0)
  {
    signal_divide_by_null();
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    return 0.0;
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  }
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  return value/val2;
}

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my_decimal *Item_func_div::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;
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  int err;
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  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if ((null_value= args[1]->null_value))
    return 0;
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  if ((err= my_decimal_div(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
                           val1, val2, prec_increment)) > 3)
  {
    if (err == E_DEC_DIV_ZERO)
      signal_divide_by_null();
    null_value= 1;
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    return 0;
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  }
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  return decimal_value;
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}


void Item_func_div::result_precision()
{
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  uint precision=min(args[0]->decimal_precision() + prec_increment,
                     DECIMAL_MAX_PRECISION);
  /* Integer operations keep unsigned_flag if one of arguments is unsigned */
  if (result_type() == INT_RESULT)
    unsigned_flag= args[0]->unsigned_flag | args[1]->unsigned_flag;
  else
    unsigned_flag= args[0]->unsigned_flag & args[1]->unsigned_flag;
  decimals= min(args[0]->decimals + prec_increment, DECIMAL_MAX_SCALE);
  max_length= my_decimal_precision_to_length(precision, decimals,
                                             unsigned_flag);
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}

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void Item_func_div::fix_length_and_dec()
{
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  DBUG_ENTER("Item_func_div::fix_length_and_dec");
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  prec_increment= current_thd->variables.div_precincrement;
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  Item_num_op::fix_length_and_dec();
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  switch(hybrid_type) {
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  case REAL_RESULT:
  {
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    decimals=max(args[0]->decimals,args[1]->decimals)+prec_increment;
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    set_if_smaller(decimals, NOT_FIXED_DEC);
    max_length=args[0]->max_length - args[0]->decimals + decimals;
    uint tmp=float_length(decimals);
    set_if_smaller(max_length,tmp);
    break;
  }
  case INT_RESULT:
    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
    result_precision();
    break;
  case DECIMAL_RESULT:
    result_precision();
    break;
  default:
    DBUG_ASSERT(0);
  }
  maybe_null= 1; // devision by zero
  DBUG_VOID_RETURN;
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}

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/* Integer division */
longlong Item_func_int_div::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=args[0]->val_int();
  longlong val2=args[1]->val_int();
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  if ((null_value= (args[0]->null_value || args[1]->null_value)))
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    return 0;
  if (val2 == 0)
  {
    signal_divide_by_null();
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    return 0;
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  }
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  return (unsigned_flag ?
	  (ulonglong) value / (ulonglong) val2 :
	  value / val2);
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}


void Item_func_int_div::fix_length_and_dec()
{
  max_length=args[0]->max_length - args[0]->decimals;
  maybe_null=1;
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  unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
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}


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longlong Item_func_mod::int_op()
{
  DBUG_ASSERT(fixed == 1);
  longlong value=  args[0]->val_int();
  longlong val2= args[1]->val_int();
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0; /* purecov: inspected */
  if (val2 == 0)
  {
    signal_divide_by_null();
    return 0;
  }
  return value % val2;
}

double Item_func_mod::real_op()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2=  args[1]->val_real();
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  if ((null_value= args[0]->null_value || args[1]->null_value))
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    return 0.0; /* purecov: inspected */
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  if (val2 == 0.0)
  {
    signal_divide_by_null();
    return 0.0;
  }
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  return fmod(value,val2);
}

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my_decimal *Item_func_mod::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal value1, *val1;
  my_decimal value2, *val2;

  val1= args[0]->val_decimal(&value1);
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  if ((null_value= args[0]->null_value))
    return 0;
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  val2= args[1]->val_decimal(&value2);
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  if ((null_value= args[1]->null_value))
    return 0;
  switch (my_decimal_mod(E_DEC_FATAL_ERROR & ~E_DEC_DIV_ZERO, decimal_value,
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                         val1, val2)) {
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  case E_DEC_TRUNCATED:
  case E_DEC_OK:
    return decimal_value;
  case E_DEC_DIV_ZERO:
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    signal_divide_by_null();
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  default:
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    null_value= 1;
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    return 0;
  }
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}

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void Item_func_mod::result_precision()
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{
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  decimals= max(args[0]->decimals, args[1]->decimals);
  max_length= max(args[0]->max_length, args[1]->max_length);
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}


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double Item_func_neg::real_op()
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{
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  double value= args[0]->val_real();
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  null_value= args[0]->null_value;
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  return -value;
}

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longlong Item_func_neg::int_op()
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{
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  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
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  return -value;
}

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my_decimal *Item_func_neg::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
  {
    my_decimal2decimal(value, decimal_value);
    my_decimal_neg(decimal_value);
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    return decimal_value;
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  }
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  return 0;
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}

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void Item_func_neg::fix_num_length_and_dec()
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{
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  decimals= args[0]->decimals;
  /* 1 add because sign can appear */
  max_length= args[0]->max_length + 1;
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}

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void Item_func_neg::fix_length_and_dec()
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{
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  DBUG_ENTER("Item_func_neg::fix_length_and_dec");
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  Item_func_num1::fix_length_and_dec();
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  /*
    If this is in integer context keep the context as integer if possible
    (This is how multiplication and other integer functions works)
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    Use val() to get value as arg_type doesn't mean that item is
    Item_int or Item_real due to existence of Item_param.
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  */
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  if (hybrid_type == INT_RESULT &&
      args[0]->type() == INT_ITEM &&
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      ((ulonglong) args[0]->val_int() >= (ulonglong) LONGLONG_MIN))
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  {
    /*
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      Ensure that result is converted to DECIMAL, as longlong can't hold
      the negated number
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    */
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    hybrid_type= DECIMAL_RESULT;
    DBUG_PRINT("info", ("Type changed: DECIMAL_RESULT"));
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  }
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  unsigned_flag= 0;
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  DBUG_VOID_RETURN;
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}

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double Item_func_abs::real_op()
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{
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  double value= args[0]->val_real();
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  null_value= args[0]->null_value;
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  return fabs(value);
}

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longlong Item_func_abs::int_op()
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{
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  longlong value= args[0]->val_int();
  null_value= args[0]->null_value;
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  return value >= 0 ? value : -value;
}

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my_decimal *Item_func_abs::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
  if (!(null_value= args[0]->null_value))
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  {
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    my_decimal2decimal(value, decimal_value);
    if (decimal_value->sign())
      my_decimal_neg(decimal_value);
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    return decimal_value;
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  }
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  return 0;
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}


void Item_func_abs::fix_length_and_dec()
{
  Item_func_num1::fix_length_and_dec();
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}

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/* Gateway to natural LOG function */
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double Item_func_ln::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value= args[0]->null_value))
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    return 0.0;
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  if (value <= 0.0)
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  {
    signal_divide_by_null();
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    return 0.0;
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  }
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  return log(value);
}

/* 
 Extended but so slower LOG function
 We have to check if all values are > zero and first one is not one
 as these are the cases then result is not a number.
*/ 
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double Item_func_log::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value= args[0]->null_value))
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    return 0.0;
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  if (value <= 0.0)
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  {
    signal_divide_by_null();
    return 0.0;
  }
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  if (arg_count == 2)
  {
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    double value2= args[1]->val_real();
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    if ((null_value= args[1]->null_value))
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      return 0.0;
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    if (value2 <= 0.0 || value == 1.0)
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    {
      signal_divide_by_null();
      return 0.0;
    }
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    return log(value2) / log(value);
  }
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  return log(value);
}

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double Item_func_log2::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
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    return 0.0;
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  if (value <= 0.0)
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  {
    signal_divide_by_null();
    return 0.0;
  }
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  return log(value) / M_LN2;
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}

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double Item_func_log10::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value= args[0]->null_value))
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    return 0.0;
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  if (value <= 0.0)
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  {
    signal_divide_by_null();
    return 0.0;
  }
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  return log10(value);
}

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double Item_func_exp::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0; /* purecov: inspected */
  return exp(value);
}

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double Item_func_sqrt::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value < 0)))
    return 0.0; /* purecov: inspected */
  return sqrt(value);
}

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double Item_func_pow::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
  double val2= args[1]->val_real();
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  if ((null_value=(args[0]->null_value || args[1]->null_value)))
    return 0.0; /* purecov: inspected */
  return pow(value,val2);
}

// Trigonometric functions

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double Item_func_acos::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
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  volatile double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(acos(value));
}

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double Item_func_asin::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  // the volatile's for BUG #2338 to calm optimizer down (because of gcc's bug)
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  volatile double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(asin(value));
}

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double Item_func_atan::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  if (arg_count == 2)
  {
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    double val2= args[1]->val_real();
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    if ((null_value=args[1]->null_value))
      return 0.0;
    return fix_result(atan2(value,val2));
  }
  return fix_result(atan(value));
}

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double Item_func_cos::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(cos(value));
}

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double Item_func_sin::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(sin(value));
}

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double Item_func_tan::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0.0;
  return fix_result(tan(value));
}


// Shift-functions, same as << and >> in C/C++


longlong Item_func_shift_left::val_int()
{
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  uint shift;
  ulonglong res= ((ulonglong) args[0]->val_int() <<
		  (shift=(uint) args[1]->val_int()));
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}

longlong Item_func_shift_right::val_int()
{
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  uint shift;
  ulonglong res= (ulonglong) args[0]->val_int() >>
    (shift=(uint) args[1]->val_int());
  if (args[0]->null_value || args[1]->null_value)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (shift < sizeof(longlong)*8 ? (longlong) res : LL(0));
}


longlong Item_func_bit_neg::val_int()
{
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  ulonglong res= (ulonglong) args[0]->val_int();
  if ((null_value=args[0]->null_value))
    return 0;
  return ~res;
}


// Conversion functions

void Item_func_integer::fix_length_and_dec()
{
  max_length=args[0]->max_length - args[0]->decimals+1;
  uint tmp=float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals=0;
}

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void Item_func_int_val::fix_num_length_and_dec()
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{
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  max_length= args[0]->max_length - (args[0]->decimals ?
                                     args[0]->decimals + 1 :
                                     0) + 2;
  uint tmp= float_length(decimals);
  set_if_smaller(max_length,tmp);
  decimals= 0;
}


void Item_func_int_val::find_num_type()
{
  DBUG_ENTER("Item_func_int_val::find_num_type");
  DBUG_PRINT("info", ("name %s", func_name()));
  switch(hybrid_type= args[0]->result_type())
  {
  case STRING_RESULT:
  case REAL_RESULT:
    hybrid_type= REAL_RESULT;
    max_length= float_length(decimals);
    break;
  case INT_RESULT:
  case DECIMAL_RESULT:
    /*
      -2 because in most high position can't be used any digit for longlong
      and one position for increasing value during operation
    */
    if ((args[0]->max_length - args[0]->decimals) >=
        (DECIMAL_LONGLONG_DIGITS - 2))
    {
      hybrid_type= DECIMAL_RESULT;
    }
    else
    {
      unsigned_flag= args[0]->unsigned_flag;
      hybrid_type= INT_RESULT;
    }
    break;
  default:
    DBUG_ASSERT(0);
  }
  DBUG_PRINT("info", ("Type: %s",
                      (hybrid_type == REAL_RESULT ? "REAL_RESULT" :
                       hybrid_type == DECIMAL_RESULT ? "DECIMAL_RESULT" :
                       hybrid_type == INT_RESULT ? "INT_RESULT" :
                       "--ILLEGAL!!!--")));

  DBUG_VOID_RETURN;
}


longlong Item_func_ceiling::int_op()
{
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  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
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    if ((dec= Item_func_ceiling::decimal_op(&dec_buf)))
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      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
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    result= (longlong)Item_func_ceiling::real_op();
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  };
  return result;
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}

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double Item_func_ceiling::real_op()
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{
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  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
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  volatile double value= args[0]->val_real();
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  null_value= args[0]->null_value;
  return ceil(value);
}


my_decimal *Item_func_ceiling::decimal_op(my_decimal *decimal_value)
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{
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  my_decimal val, *value= args[0]->val_decimal(&val);
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  if (!(null_value= (args[0]->null_value ||
                     my_decimal_ceiling(E_DEC_FATAL_ERROR, value,
                                        decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


longlong Item_func_floor::int_op()
{
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  longlong result;
  switch (args[0]->result_type()) {
  case INT_RESULT:
    result= args[0]->val_int();
    null_value= args[0]->null_value;
    break;
  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec;
    if ((dec= Item_func_floor::decimal_op(&dec_buf)))
      my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
    else
      result= 0;
    break;
  }
  default:
    result= (longlong)Item_func_floor::real_op();
  };
  return result;
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}

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double Item_func_floor::real_op()
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{
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  /*
    the volatile's for BUG #3051 to calm optimizer down (because of gcc's
    bug)
  */
  volatile double value= args[0]->val_real();
  null_value= args[0]->null_value;
  return floor(value);
}


my_decimal *Item_func_floor::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
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  if (!(null_value= (args[0]->null_value ||
                     my_decimal_floor(E_DEC_FATAL_ERROR, value,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


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void Item_func_round::fix_length_and_dec()
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{
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  unsigned_flag= args[0]->unsigned_flag;
  if (!args[1]->const_item())
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  {
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    max_length= args[0]->max_length;
    decimals= args[0]->decimals;
    hybrid_type= REAL_RESULT;
    return;
  }
  
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  int decimals_to_set= max((int)args[1]->val_int(), 0);
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  if (args[0]->decimals == NOT_FIXED_DEC)
  {
    max_length= args[0]->max_length;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    hybrid_type= REAL_RESULT;
    return;
  }
  
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  switch (args[0]->result_type()) {
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  case REAL_RESULT:
  case STRING_RESULT:
    hybrid_type= REAL_RESULT;
    decimals= min(decimals_to_set, NOT_FIXED_DEC);
    max_length= float_length(decimals);
    break;
  case INT_RESULT:
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    if (!decimals_to_set &&
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        (truncate || (args[0]->decimal_precision() < DECIMAL_LONGLONG_DIGITS)))
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    {
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      int length_can_increase= test(!truncate && (args[1]->val_int() < 0));
      max_length= args[0]->max_length + length_can_increase;
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      /* Here we can keep INT_RESULT */
      hybrid_type= INT_RESULT;
      decimals= 0;
      break;
    }
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    /* fall through */
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  case DECIMAL_RESULT:
  {
    hybrid_type= DECIMAL_RESULT;
    int decimals_delta= args[0]->decimals - decimals_to_set;
    int precision= args[0]->decimal_precision();
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    int length_increase= ((decimals_delta <= 0) || truncate) ? 0:1;

    precision-= decimals_delta - length_increase;
    decimals= decimals_to_set;
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    max_length= my_decimal_precision_to_length(precision, decimals,
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                                               unsigned_flag);
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    break;
  }
  default:
    DBUG_ASSERT(0); /* This result type isn't handled */
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  }
}

1842
double my_double_round(double value, int dec, bool truncate)
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{
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  double tmp;
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  uint abs_dec= abs(dec);
1846 1847 1848 1849 1850
  /*
    tmp2 is here to avoid return the value with 80 bit precision
    This will fix that the test round(0.1,1) = round(0.1,1) is true
  */
  volatile double tmp2;
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  tmp=(abs_dec < array_elements(log_10) ?
       log_10[abs_dec] : pow(10.0,(double) abs_dec));
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  if (truncate)
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  {
    if (value >= 0)
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      tmp2= dec < 0 ? floor(value/tmp)*tmp : floor(value*tmp)/tmp;
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    else
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      tmp2= dec < 0 ? ceil(value/tmp)*tmp : ceil(value*tmp)/tmp;
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  }
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  else
    tmp2=dec < 0 ? rint(value/tmp)*tmp : rint(value*tmp)/tmp;
  return tmp2;
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}


1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
double Item_func_round::real_op()
{
  double value= args[0]->val_real();
  int dec= (int) args[1]->val_int();

  if (!(null_value= args[0]->null_value || args[1]->null_value))
    return my_double_round(value, dec, truncate);

  return 0.0;
}


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longlong Item_func_round::int_op()
{
  longlong value= args[0]->val_int();
  int dec=(int) args[1]->val_int();
  decimals= 0;
  uint abs_dec;
  if ((null_value= args[0]->null_value || args[1]->null_value))
    return 0;
  if (dec >= 0)
    return value; // integer have not digits after point

  abs_dec= -dec;
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  longlong tmp;
  
  if(abs_dec >= array_elements(log_10_int))
    return 0;
  
  tmp= log_10_int[abs_dec];
  
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  if (truncate)
  {
    if (unsigned_flag)
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      value= (ulonglong(value)/tmp)*tmp;
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    else
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      value= (value/tmp)*tmp;
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  }
  else
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  {
    if (unsigned_flag)
      value= ((ulonglong(value)+(tmp>>1))/tmp)*tmp;
    else if ( value >= 0)
      value= ((value+(tmp>>1))/tmp)*tmp;
    else
      value= ((value-(tmp>>1))/tmp)*tmp;
  }
  return value;
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}


my_decimal *Item_func_round::decimal_op(my_decimal *decimal_value)
{
  my_decimal val, *value= args[0]->val_decimal(&val);
  int dec=(int) args[1]->val_int();
  if (dec > 0)
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  {
    decimals= min(dec, DECIMAL_MAX_SCALE); // to get correct output
  }
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  if (!(null_value= (args[0]->null_value || args[1]->null_value ||
                     my_decimal_round(E_DEC_FATAL_ERROR, value, dec, truncate,
                                      decimal_value) > 1)))
    return decimal_value;
  return 0;
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}


1935
bool Item_func_rand::fix_fields(THD *thd,Item **ref)
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{
1937
  if (Item_real_func::fix_fields(thd, ref))
1938
    return TRUE;
1939
  used_tables_cache|= RAND_TABLE_BIT;
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  if (arg_count)
  {					// Only use argument once in query
1942 1943 1944 1945 1946
    if (!args[0]->const_during_execution())
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "RAND");
      return TRUE;
    }
1947
    /*
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      Allocate rand structure once: we must use thd->stmt_arena
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      to create rand in proper mem_root if it's a prepared statement or
      stored procedure.
1951 1952 1953

      No need to send a Rand log event if seed was given eg: RAND(seed),
      as it will be replicated in the query as such.
1954 1955
    */
    if (!rand && !(rand= (struct rand_struct*)
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                   thd->stmt_arena->alloc(sizeof(*rand))))
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971
      return TRUE;
    /*
      PARAM_ITEM is returned if we're in statement prepare and consequently
      no placeholder value is set yet.
    */
    if (args[0]->type() != PARAM_ITEM)
    {
      /*
        TODO: do not do reinit 'rand' for every execute of PS/SP if
        args[0] is a constant.
      */
      uint32 tmp= (uint32) args[0]->val_int();
      randominit(rand, (uint32) (tmp*0x10001L+55555555L),
                 (uint32) (tmp*0x10000001L));
    }
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  }
1973
  else
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  {
1975 1976 1977 1978 1979
    /*
      Save the seed only the first time RAND() is used in the query
      Once events are forwarded rather than recreated,
      the following can be skipped if inside the slave thread
    */
1980 1981 1982 1983 1984 1985
    if (!thd->rand_used)
    {
      thd->rand_used= 1;
      thd->rand_saved_seed1= thd->rand.seed1;
      thd->rand_saved_seed2= thd->rand.seed2;
    }
1986
    rand= &thd->rand;
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  }
1988
  return FALSE;
1989 1990
}

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void Item_func_rand::update_used_tables()
{
  Item_real_func::update_used_tables();
  used_tables_cache|= RAND_TABLE_BIT;
}

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double Item_func_rand::val_real()
1999
{
2000
  DBUG_ASSERT(fixed == 1);
2001
  return my_rnd(rand);
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}

longlong Item_func_sign::val_int()
{
2006
  DBUG_ASSERT(fixed == 1);
2007
  double value= args[0]->val_real();
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  null_value=args[0]->null_value;
  return value < 0.0 ? -1 : (value > 0 ? 1 : 0);
}


2013
double Item_func_units::val_real()
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{
2015
  DBUG_ASSERT(fixed == 1);
2016
  double value= args[0]->val_real();
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  if ((null_value=args[0]->null_value))
    return 0;
  return value*mul+add;
}


void Item_func_min_max::fix_length_and_dec()
{
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  int max_int_part=0;
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  decimals=0;
  max_length=0;
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  maybe_null=0;
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  cmp_type=args[0]->result_type();
2030

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  for (uint i=0 ; i < arg_count ; i++)
  {
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    set_if_bigger(max_length, args[i]->max_length);
    set_if_bigger(decimals, args[i]->decimals);
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    set_if_bigger(max_int_part, args[i]->decimal_int_part());
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    if (args[i]->maybe_null)
      maybe_null=1;
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    cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
  }
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  if (cmp_type == STRING_RESULT)
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    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV, 1);
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  else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
    max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
                                            unsigned_flag);
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}


String *Item_func_min_max::val_str(String *str)
{
2050
  DBUG_ASSERT(fixed == 1);
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  switch (cmp_type) {
  case INT_RESULT:
  {
    longlong nr=val_int();
    if (null_value)
      return 0;
2057
    if (!unsigned_flag)
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      str->set(nr,&my_charset_bin);
2059
    else
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      str->set((ulonglong) nr,&my_charset_bin);
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    return str;
  }
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  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec_val= val_decimal(&dec_buf);
    if (null_value)
      return 0;
    my_decimal2string(E_DEC_FATAL_ERROR, dec_val, 0, 0, 0, str);
    return str;
  }
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  case REAL_RESULT:
  {
2073
    double nr= val_real();
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    if (null_value)
      return 0; /* purecov: inspected */
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    str->set(nr,decimals,&my_charset_bin);
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    return str;
  }
  case STRING_RESULT:
  {
    String *res;
    LINT_INIT(res);
    for (uint i=0; i < arg_count ; i++)
    {
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      if (i == 0)
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	res=args[i]->val_str(str);
      else
      {
	String *res2;
	res2= args[i]->val_str(res == str ? &tmp_value : str);
	if (res2)
	{
2093
	  int cmp= sortcmp(res,res2,collation.collation);
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	  if ((cmp_sign < 0 ? cmp : -cmp) < 0)
	    res=res2;
	}
      }
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      if ((null_value= args[i]->null_value))
2099
        return 0;
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    }
2101
    res->set_charset(collation.collation);
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    return res;
  }
2104
  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    return 0;
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  }
  return 0;					// Keep compiler happy
}


2114
double Item_func_min_max::val_real()
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{
2116
  DBUG_ASSERT(fixed == 1);
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  double value=0.0;
  for (uint i=0; i < arg_count ; i++)
  {
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    if (i == 0)
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      value= args[i]->val_real();
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    else
    {
2124
      double tmp= args[i]->val_real();
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      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
    }
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    if ((null_value= args[i]->null_value))
      break;
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  }
  return value;
}


longlong Item_func_min_max::val_int()
{
2137
  DBUG_ASSERT(fixed == 1);
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  longlong value=0;
2139 2140
  my_bool arg_unsigned_flag;
  my_bool cmp;
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  for (uint i=0; i < arg_count ; i++)
  {
2143
    longlong tmp= args[i]->val_int();
2144 2145
    if ((null_value= args[i]->null_value))
      break;
2146
    arg_unsigned_flag= args[i]->unsigned_flag;
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    if (i == 0)
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    {
2149 2150
      value= tmp;
      unsigned_flag= arg_unsigned_flag;
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    }
    else
    {
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      if (unsigned_flag == arg_unsigned_flag)
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
        cmp= tmp < value;
      else if (unsigned_flag)
        cmp= compare_int_signed_unsigned(tmp, value) < 0;
      else
        cmp= compare_int_unsigned_signed(tmp, value) < 0;
      if ((cmp ? cmp_sign : -cmp_sign) > 0)
      {
        value= tmp;
        unsigned_flag= arg_unsigned_flag;
      }
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    }
  }
  return value;
}

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my_decimal *Item_func_min_max::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
2174 2175 2176
  my_decimal tmp_buf, *tmp, *res;
  LINT_INIT(res);

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  for (uint i=0; i < arg_count ; i++)
  {
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    if (i == 0)
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      res= args[i]->val_decimal(dec);
    else
    {
2183 2184
      tmp= args[i]->val_decimal(&tmp_buf);      // Zero if NULL
      if (tmp && (my_decimal_cmp(tmp, res) * cmp_sign) < 0)
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      {
        if (tmp == &tmp_buf)
        {
2188
          /* Move value out of tmp_buf as this will be reused on next loop */
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          my_decimal2decimal(tmp, dec);
          res= dec;
        }
        else
          res= tmp;
      }
    }
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    if ((null_value= args[i]->null_value))
2197 2198
    {
      res= 0;
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      break;
2200
    }
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  }
  return res;
}


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longlong Item_func_length::val_int()
{
2208
  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) res->length();
}

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longlong Item_func_char_length::val_int()
{
2222
  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
2230
  return (longlong) res->numchars();
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}

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longlong Item_func_coercibility::val_int()
{
2236
  DBUG_ASSERT(fixed == 1);
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  null_value= 0;
2238
  return (longlong) args[0]->collation.derivation;
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}
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2242 2243 2244
void Item_func_locate::fix_length_and_dec()
{
  maybe_null=0; max_length=11;
2245
  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
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}

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longlong Item_func_locate::val_int()
{
2251
  DBUG_ASSERT(fixed == 1);
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  String *a=args[0]->val_str(&value1);
  String *b=args[1]->val_str(&value2);
  if (!a || !b)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
2260 2261
  uint start=0;
  uint start0=0;
2262
  my_match_t match;
2263

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  if (arg_count == 3)
  {
2266 2267 2268
    start0= start =(uint) args[2]->val_int()-1;
    start=a->charpos(start);
    
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    if (start > a->length() || start+b->length() > a->length())
      return 0;
  }
2272

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  if (!b->length())				// Found empty string at start
    return (longlong) (start+1);
2275
  
2276
  if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
2277
                                            a->ptr()+start, a->length()-start,
2278 2279 2280 2281
                                            b->ptr(), b->length(),
                                            &match, 1))
    return 0;
  return (longlong) match.mblen + start0 + 1;
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}


2285 2286
void Item_func_locate::print(String *str)
{
2287
  str->append(STRING_WITH_LEN("locate("));
2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299
  args[1]->print(str);
  str->append(',');
  args[0]->print(str);
  if (arg_count == 3)
  {
    str->append(',');
    args[2]->print(str);
  }
  str->append(')');
}


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longlong Item_func_field::val_int()
{
2302
  DBUG_ASSERT(fixed == 1);
2303

2304 2305 2306
  if (cmp_type == STRING_RESULT)
  {
    String *field;
2307 2308
    if (!(field= args[0]->val_str(&value)))
      return 0;
2309
    for (uint i=1 ; i < arg_count ; i++)
2310 2311
    {
      String *tmp_value=args[i]->val_str(&tmp);
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      if (tmp_value && !sortcmp(field,tmp_value,cmp_collation.collation))
2313
        return (longlong) (i);
2314 2315 2316 2317
    }
  }
  else if (cmp_type == INT_RESULT)
  {
2318
    longlong val= args[0]->val_int();
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    if (args[0]->null_value)
      return 0;
2321
    for (uint i=1; i < arg_count ; i++)
2322
    {
2323
      if (val == args[i]->val_int() && !args[i]->null_value)
2324
        return (longlong) (i);
2325 2326
    }
  }
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  else if (cmp_type == DECIMAL_RESULT)
  {
    my_decimal dec_arg_buf, *dec_arg,
               dec_buf, *dec= args[0]->val_decimal(&dec_buf);
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    if (args[0]->null_value)
      return 0;
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    for (uint i=1; i < arg_count; i++)
    {
      dec_arg= args[i]->val_decimal(&dec_arg_buf);
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      if (!args[i]->null_value && !my_decimal_cmp(dec_arg, dec))
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        return (longlong) (i);
    }
  }
2340
  else
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  {
2342
    double val= args[0]->val_real();
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    if (args[0]->null_value)
      return 0;
2345
    for (uint i=1; i < arg_count ; i++)
2346
    {
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      if (val == args[i]->val_real() && !args[i]->null_value)
2348
        return (longlong) (i);
2349
    }
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  }
  return 0;
}

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2355 2356 2357
void Item_func_field::fix_length_and_dec()
{
  maybe_null=0; max_length=3;
2358 2359
  cmp_type= args[0]->result_type();
  for (uint i=1; i < arg_count ; i++)
2360 2361
    cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
  if (cmp_type == STRING_RESULT)
2362
    agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV, 1);
2363
}
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2365

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longlong Item_func_ascii::val_int()
{
2368
  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  return (longlong) (res->length() ? (uchar) (*res)[0] : (uchar) 0);
}

longlong Item_func_ord::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0;
  }
  null_value=0;
  if (!res->length()) return 0;
#ifdef USE_MB
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  if (use_mb(res->charset()))
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  {
    register const char *str=res->ptr();
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    register uint32 n=0, l=my_ismbchar(res->charset(),str,str+res->length());
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    if (!l)
      return (longlong)((uchar) *str);
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    while (l--)
      n=(n<<8)|(uint32)((uchar) *str++);
    return (longlong) n;
  }
#endif
  return (longlong) ((uchar) (*res)[0]);
}

	/* Search after a string in a string of strings separated by ',' */
	/* Returns number of found type >= 1 or 0 if not found */
	/* This optimizes searching in enums to bit testing! */

void Item_func_find_in_set::fix_length_and_dec()
{
  decimals=0;
  max_length=3;					// 1-999
  if (args[0]->const_item() && args[1]->type() == FIELD_ITEM)
  {
    Field *field= ((Item_field*) args[1])->field;
    if (field->real_type() == FIELD_TYPE_SET)
    {
      String *find=args[0]->val_str(&value);
      if (find)
      {
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	enum_value= find_type(((Field_enum*) field)->typelib,find->ptr(),
			      find->length(), 0);
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	enum_bit=0;
	if (enum_value)
	  enum_bit=LL(1) << (enum_value-1);
      }
    }
  }
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  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
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}

static const char separator=',';

longlong Item_func_find_in_set::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  if (enum_value)
  {
    ulonglong tmp=(ulonglong) args[1]->val_int();
    if (!(null_value=args[1]->null_value || args[0]->null_value))
    {
      if (tmp & enum_bit)
	return enum_value;
    }
    return 0L;
  }

  String *find=args[0]->val_str(&value);
  String *buffer=args[1]->val_str(&value2);
  if (!find || !buffer)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;

  int diff;
  if ((diff=buffer->length() - find->length()) >= 0)
  {
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    my_wc_t wc;
    CHARSET_INFO *cs= cmp_collation.collation;
    const char *str_begin= buffer->ptr();
    const char *str_end= buffer->ptr();
    const char *real_end= str_end+buffer->length();
    const uchar *find_str= (const uchar *) find->ptr();
    uint find_str_len= find->length();
    int position= 0;
    while (1)
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    {
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      int symbol_len;
      if ((symbol_len= cs->cset->mb_wc(cs, &wc, (uchar*) str_end, 
                                       (uchar*) real_end)) > 0)
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      {
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        const char *substr_end= str_end + symbol_len;
        bool is_last_item= (substr_end == real_end);
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        bool is_separator= (wc == (my_wc_t) separator);
        if (is_separator || is_last_item)
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        {
          position++;
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          if (is_last_item && !is_separator)
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            str_end= substr_end;
          if (!my_strnncoll(cs, (const uchar *) str_begin,
                            str_end - str_begin,
                            find_str, find_str_len))
            return (longlong) position;
          else
            str_begin= substr_end;
        }
        str_end= substr_end;
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      }
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      else if (str_end - str_begin == 0 &&
               find_str_len == 0 &&
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               wc == (my_wc_t) separator)
        return (longlong) ++position;
      else
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        return LL(0);
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    }
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  }
  return 0;
}

longlong Item_func_bit_count::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  ulonglong value= (ulonglong) args[0]->val_int();
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  if ((null_value= args[0]->null_value))
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    return 0; /* purecov: inspected */
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  return (longlong) my_count_bits(value);
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}


/****************************************************************************
** Functions to handle dynamic loadable functions
** Original source by: Alexis Mikhailov <root@medinf.chuvashia.su>
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** Rewritten by monty.
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****************************************************************************/

#ifdef HAVE_DLOPEN

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void udf_handler::cleanup()
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{
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  if (!not_original)
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  {
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    if (initialized)
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    {
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      if (u_d->func_deinit != NULL)
      {
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        Udf_func_deinit deinit= u_d->func_deinit;
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        (*deinit)(&initid);
      }
      free_udf(u_d);
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      initialized= FALSE;
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    }
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    if (buffers)				// Because of bug in ecc
      delete [] buffers;
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    buffers= 0;
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  }
}


bool
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udf_handler::fix_fields(THD *thd, Item_result_field *func,
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			uint arg_count, Item **arguments)
{
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#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
  char buff[STACK_BUFF_ALLOC];			// Max argument in function
#endif
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  DBUG_ENTER("Item_udf_func::fix_fields");

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  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
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    DBUG_RETURN(TRUE);				// Fatal error flag is set!
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  udf_func *tmp_udf=find_udf(u_d->name.str,(uint) u_d->name.length,1);
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  if (!tmp_udf)
  {
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    my_error(ER_CANT_FIND_UDF, MYF(0), u_d->name.str, errno);
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    DBUG_RETURN(TRUE);
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  }
  u_d=tmp_udf;
  args=arguments;

  /* Fix all arguments */
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  func->maybe_null=0;
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  used_tables_cache=0;
  const_item_cache=1;

  if ((f_args.arg_count=arg_count))
  {
    if (!(f_args.arg_type= (Item_result*)
	  sql_alloc(f_args.arg_count*sizeof(Item_result))))

    {
      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
    uint i;
    Item **arg,**arg_end;
    for (i=0, arg=arguments, arg_end=arguments+arg_count;
	 arg != arg_end ;
	 arg++,i++)
    {
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      if (!(*arg)->fixed &&
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          (*arg)->fix_fields(thd, arg))
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	DBUG_RETURN(1);
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      // we can't assign 'item' before, because fix_fields() can change arg
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      Item *item= *arg;
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      if (item->check_cols(1))
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	DBUG_RETURN(TRUE);
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      /*
	TODO: We should think about this. It is not always
	right way just to set an UDF result to return my_charset_bin
	if one argument has binary sorting order.
	The result collation should be calculated according to arguments
	derivations in some cases and should not in other cases.
	Moreover, some arguments can represent a numeric input
	which doesn't effect the result character set and collation.
	There is no a general rule for UDF. Everything depends on
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        the particular user defined function.
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      */
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      if (item->collation.collation->state & MY_CS_BINSORT)
	func->collation.set(&my_charset_bin);
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      if (item->maybe_null)
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	func->maybe_null=1;
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      func->with_sum_func= func->with_sum_func || item->with_sum_func;
      used_tables_cache|=item->used_tables();
      const_item_cache&=item->const_item();
      f_args.arg_type[i]=item->result_type();
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    }
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    //TODO: why all following memory is not allocated with 1 call of sql_alloc?
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    if (!(buffers=new String[arg_count]) ||
	!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
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	!(f_args.lengths= (ulong*) sql_alloc(arg_count * sizeof(long))) ||
	!(f_args.maybe_null= (char*) sql_alloc(arg_count * sizeof(char))) ||
	!(num_buffer= (char*) sql_alloc(arg_count *
					ALIGN_SIZE(sizeof(double)))) ||
	!(f_args.attributes= (char**) sql_alloc(arg_count * sizeof(char *))) ||
	!(f_args.attribute_lengths= (ulong*) sql_alloc(arg_count *
						       sizeof(long))))
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    {
      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
  }
  func->fix_length_and_dec();
  initid.max_length=func->max_length;
  initid.maybe_null=func->maybe_null;
  initid.const_item=const_item_cache;
  initid.decimals=func->decimals;
  initid.ptr=0;

  if (u_d->func_init)
  {
    char *to=num_buffer;
    for (uint i=0; i < arg_count; i++)
    {
      f_args.args[i]=0;
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      f_args.lengths[i]= arguments[i]->max_length;
      f_args.maybe_null[i]= (char) arguments[i]->maybe_null;
      f_args.attributes[i]= arguments[i]->name;
      f_args.attribute_lengths[i]= arguments[i]->name_length;
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      switch(arguments[i]->type()) {
      case Item::STRING_ITEM:			// Constant string !
      {
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	String *res=arguments[i]->val_str(&buffers[i]);
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	if (arguments[i]->null_value)
	  continue;
	f_args.args[i]=    (char*) res->ptr();
	break;
      }
      case Item::INT_ITEM:
	*((longlong*) to) = arguments[i]->val_int();
	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(longlong));
	}
	break;
      case Item::REAL_ITEM:
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	*((double*) to)= arguments[i]->val_real();
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	if (!arguments[i]->null_value)
	{
	  f_args.args[i]=to;
	  to+= ALIGN_SIZE(sizeof(double));
	}
	break;
      default:					// Skip these
	break;
      }
    }
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    thd->net.last_error[0]=0;
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    Udf_func_init init= u_d->func_init;
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    if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
    {
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      my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
               u_d->name.str, thd->net.last_error);
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      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
    func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
    func->maybe_null=initid.maybe_null;
    const_item_cache=initid.const_item;
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    func->decimals=min(initid.decimals,NOT_FIXED_DEC);
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  }
  initialized=1;
  if (error)
  {
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    my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
             u_d->name.str, ER(ER_UNKNOWN_ERROR));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(FALSE);
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}


bool udf_handler::get_arguments()
{
  if (error)
    return 1;					// Got an error earlier
  char *to= num_buffer;
  uint str_count=0;
  for (uint i=0; i < f_args.arg_count; i++)
  {
    f_args.args[i]=0;
    switch (f_args.arg_type[i]) {
    case STRING_RESULT:
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    case DECIMAL_RESULT:
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      {
	String *res=args[i]->val_str(&buffers[str_count++]);
	if (!(args[i]->null_value))
	{
	  f_args.args[i]=    (char*) res->ptr();
	  f_args.lengths[i]= res->length();
	  break;
	}
      }
    case INT_RESULT:
      *((longlong*) to) = args[i]->val_int();
      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(longlong));
      }
      break;
    case REAL_RESULT:
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      *((double*) to)= args[i]->val_real();
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      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(double));
      }
      break;
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    case ROW_RESULT:
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    default:
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      // This case should never be chosen
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      DBUG_ASSERT(0);
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      break;
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    }
  }
  return 0;
}

/* This returns (String*) 0 in case of NULL values */

String *udf_handler::val_str(String *str,String *save_str)
{
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  uchar is_null_tmp=0;
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  ulong res_length;
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  DBUG_ENTER("udf_handler::val_str");
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  if (get_arguments())
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    DBUG_RETURN(0);
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  char * (*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

  if ((res_length=str->alloced_length()) < MAX_FIELD_WIDTH)
  {						// This happens VERY seldom
    if (str->alloc(MAX_FIELD_WIDTH))
    {
      error=1;
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      DBUG_RETURN(0);
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    }
  }
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  char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length,
		 &is_null_tmp, &error);
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  DBUG_PRINT("info", ("udf func returned, res_length: %lu", res_length));
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  if (is_null_tmp || !res || error)		// The !res is for safety
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  {
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    DBUG_PRINT("info", ("Null or error"));
    DBUG_RETURN(0);
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  }
  if (res == str->ptr())
  {
    str->length(res_length);
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    DBUG_PRINT("exit", ("str: %s", str->ptr()));
    DBUG_RETURN(str);
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  }
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  save_str->set(res, res_length, str->charset());
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  DBUG_PRINT("exit", ("save_str: %s", save_str->ptr()));
  DBUG_RETURN(save_str);
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}


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/*
  For the moment, UDF functions are returning DECIMAL values as strings
*/

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my_decimal *udf_handler::val_decimal(my_bool *null_value, my_decimal *dec_buf)
{
  char buf[DECIMAL_MAX_STR_LENGTH+1], *end;
  ulong res_length= DECIMAL_MAX_STR_LENGTH;

  if (get_arguments())
  {
    *null_value=1;
    return 0;
  }
  char *(*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

  char *res= func(&initid, &f_args, buf, &res_length, &is_null, &error);
  if (is_null || error)
  {
    *null_value= 1;
    return 0;
  }
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  end= res+ res_length;
  str2my_decimal(E_DEC_FATAL_ERROR, res, dec_buf, &end);
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  return dec_buf;
}

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void Item_udf_func::cleanup()
{
  udf.cleanup();
  Item_func::cleanup();
}

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double Item_func_udf_float::val_real()
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{
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  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_udf_float::val");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));
  DBUG_RETURN(udf.val(&null_value));
}


String *Item_func_udf_float::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  double nr= val_real();
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  if (null_value)
    return 0;					/* purecov: inspected */
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  str->set(nr,decimals,&my_charset_bin);
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  return str;
}


longlong Item_func_udf_int::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_udf_int::val_int");
  DBUG_RETURN(udf.val_int(&null_value));
}


String *Item_func_udf_int::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  longlong nr=val_int();
  if (null_value)
    return 0;
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  if (!unsigned_flag)
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    str->set(nr,&my_charset_bin);
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  else
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    str->set((ulonglong) nr,&my_charset_bin);
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  return str;
}

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longlong Item_func_udf_decimal::val_int()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
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  longlong result;
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  if (null_value)
    return 0;
  my_decimal2int(E_DEC_FATAL_ERROR, dec, unsigned_flag, &result);
  return result;
}


double Item_func_udf_decimal::val_real()
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
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  double result;
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  if (null_value)
    return 0.0;
  my_decimal2double(E_DEC_FATAL_ERROR, dec, &result);
  return result;
}


my_decimal *Item_func_udf_decimal::val_decimal(my_decimal *dec_buf)
{
  DBUG_ASSERT(fixed == 1);
  DBUG_ENTER("Item_func_udf_decimal::val_decimal");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
                     args[0]->result_type(), arg_count));

  DBUG_RETURN(udf.val_decimal(&null_value, dec_buf));
}


String *Item_func_udf_decimal::val_str(String *str)
{
  my_decimal dec_buf, *dec= udf.val_decimal(&null_value, &dec_buf);
  if (null_value)
    return 0;
  if (str->length() < DECIMAL_MAX_STR_LENGTH)
    str->length(DECIMAL_MAX_STR_LENGTH);
  my_decimal_round(E_DEC_FATAL_ERROR, dec, decimals, FALSE, &dec_buf);
  my_decimal2string(E_DEC_FATAL_ERROR, &dec_buf, 0, 0, '0', str);
  return str;
}


void Item_func_udf_decimal::fix_length_and_dec()
{
  fix_num_length_and_dec();
}


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/* Default max_length is max argument length */

void Item_func_udf_str::fix_length_and_dec()
{
  DBUG_ENTER("Item_func_udf_str::fix_length_and_dec");
  max_length=0;
  for (uint i = 0; i < arg_count; i++)
    set_if_bigger(max_length,args[i]->max_length);
  DBUG_VOID_RETURN;
}

String *Item_func_udf_str::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=udf.val_str(str,&str_value);
  null_value = !res;
  return res;
}

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/*
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   This has to come last in the udf_handler methods, or C for AIX
   version 6.0.0.0 fails to compile with debugging enabled. (Yes, really.)
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 */

udf_handler::~udf_handler()
{
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  /* Everything should be properly cleaned up by this moment. */
  DBUG_ASSERT(not_original || !(initialized || buffers));
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}

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#else
bool udf_handler::get_arguments() { return 0; }
#endif /* HAVE_DLOPEN */

/*
** User level locks
*/

pthread_mutex_t LOCK_user_locks;
static HASH hash_user_locks;

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class User_level_lock
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{
  char *key;
  uint key_length;

public:
  int count;
  bool locked;
  pthread_cond_t cond;
  pthread_t thread;
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  ulong thread_id;
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  User_level_lock(const char *key_arg,uint length, ulong id) 
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    :key_length(length),count(1),locked(1), thread_id(id)
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  {
    key=(char*) my_memdup((byte*) key_arg,length,MYF(0));
    pthread_cond_init(&cond,NULL);
    if (key)
    {
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      if (my_hash_insert(&hash_user_locks,(byte*) this))
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      {
	my_free((gptr) key,MYF(0));
	key=0;
      }
    }
  }
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  ~User_level_lock()
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  {
    if (key)
    {
      hash_delete(&hash_user_locks,(byte*) this);
      my_free((gptr) key,MYF(0));
    }
    pthread_cond_destroy(&cond);
  }
  inline bool initialized() { return key != 0; }
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  friend void item_user_lock_release(User_level_lock *ull);
  friend char *ull_get_key(const User_level_lock *ull, uint *length,
                           my_bool not_used);
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};

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char *ull_get_key(const User_level_lock *ull, uint *length,
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		  my_bool not_used __attribute__((unused)))
{
  *length=(uint) ull->key_length;
  return (char*) ull->key;
}

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static bool item_user_lock_inited= 0;

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void item_user_lock_init(void)
{
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  pthread_mutex_init(&LOCK_user_locks,MY_MUTEX_INIT_SLOW);
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  hash_init(&hash_user_locks,system_charset_info,
	    16,0,0,(hash_get_key) ull_get_key,NULL,0);
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  item_user_lock_inited= 1;
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}

void item_user_lock_free(void)
{
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  if (item_user_lock_inited)
  {
    item_user_lock_inited= 0;
    hash_free(&hash_user_locks);
    pthread_mutex_destroy(&LOCK_user_locks);
  }
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}

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void item_user_lock_release(User_level_lock *ull)
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{
  ull->locked=0;
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  ull->thread_id= 0;
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  if (--ull->count)
    pthread_cond_signal(&ull->cond);
  else
    delete ull;
}

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/*
   Wait until we are at or past the given position in the master binlog
   on the slave
 */

longlong Item_master_pos_wait::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  THD* thd = current_thd;
  String *log_name = args[0]->val_str(&value);
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  int event_count= 0;
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  null_value=0;
  if (thd->slave_thread || !log_name || !log_name->length())
  {
    null_value = 1;
    return 0;
  }
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  longlong pos = (ulong)args[1]->val_int();
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  longlong timeout = (arg_count==3) ? args[2]->val_int() : 0 ;
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#ifdef HAVE_REPLICATION
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  if ((event_count = active_mi->rli.wait_for_pos(thd, log_name, pos, timeout)) == -2)
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  {
    null_value = 1;
    event_count=0;
  }
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#endif
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  return event_count;
}

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#ifdef EXTRA_DEBUG
void debug_sync_point(const char* lock_name, uint lock_timeout)
{
  THD* thd=current_thd;
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  User_level_lock* ull;
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  struct timespec abstime;
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  int lock_name_len;
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  lock_name_len=strlen(lock_name);
  pthread_mutex_lock(&LOCK_user_locks);

  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }

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  /*
    If the lock has not been aquired by some client, we do not want to
    create an entry for it, since we immediately release the lock. In
    this case, we will not be waiting, but rather, just waste CPU and
    memory on the whole deal
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  */
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  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks, lock_name,
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				 lock_name_len))))
  {
    pthread_mutex_unlock(&LOCK_user_locks);
    return;
  }
  ull->count++;

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  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks
  */
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  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

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  set_timespec(abstime,lock_timeout);
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  while (ull->locked && !thd->killed)
  {
    int error= pthread_cond_timedwait(&ull->cond, &LOCK_user_locks, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
  }

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  if (ull->locked)
  {
    if (!--ull->count)
      delete ull;				// Should never happen
  }
  else
  {
    ull->locked=1;
    ull->thread=thd->real_id;
    thd->ull=ull;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->proc_info=0;
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);
  pthread_mutex_lock(&LOCK_user_locks);
  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);
}

#endif

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/*
  Get a user level lock. If the thread has an old lock this is first released.
  Returns 1:  Got lock
  Returns 0:  Timeout
  Returns NULL: Error
*/

longlong Item_func_get_lock::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  longlong timeout=args[1]->val_int();
  struct timespec abstime;
  THD *thd=current_thd;
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  User_level_lock *ull;
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  int error;
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  /*
    In slave thread no need to get locks, everything is serialized. Anyway
    there is no way to make GET_LOCK() work on slave like it did on master
    (i.e. make it return exactly the same value) because we don't have the
    same other concurrent threads environment. No matter what we return here,
    it's not guaranteed to be same as on master.
  */
  if (thd->slave_thread)
    return 1;

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  pthread_mutex_lock(&LOCK_user_locks);

  if (!res || !res->length())
  {
    pthread_mutex_unlock(&LOCK_user_locks);
    null_value=1;
    return 0;
  }
  null_value=0;

  if (thd->ull)
  {
    item_user_lock_release(thd->ull);
    thd->ull=0;
  }

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  if (!(ull= ((User_level_lock *) hash_search(&hash_user_locks,
                                              (byte*) res->ptr(),
                                              res->length()))))
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  {
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    ull=new User_level_lock(res->ptr(),res->length(), thd->thread_id);
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    if (!ull || !ull->initialized())
    {
      delete ull;
      pthread_mutex_unlock(&LOCK_user_locks);
      null_value=1;				// Probably out of memory
      return 0;
    }
    ull->thread=thd->real_id;
    thd->ull=ull;
    pthread_mutex_unlock(&LOCK_user_locks);
    return 1;					// Got new lock
  }
  ull->count++;

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  /*
    Structure is now initialized.  Try to get the lock.
    Set up control struct to allow others to abort locks.
  */
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  thd->proc_info="User lock";
  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &ull->cond;

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  set_timespec(abstime,timeout);
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  error= 0;
  while (ull->locked && !thd->killed)
  {
    error= pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
    error= 0;
  }

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  if (ull->locked)
  {
    if (!--ull->count)
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    {
      DBUG_ASSERT(0);
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      delete ull;				// Should never happen
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    }
    if (!error)                                 // Killed (thd->killed != 0)
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    {
      error=1;
      null_value=1;				// Return NULL
    }
  }
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  else                                          // We got the lock
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  {
    ull->locked=1;
    ull->thread=thd->real_id;
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    ull->thread_id= thd->thread_id;
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    thd->ull=ull;
    error=0;
  }
  pthread_mutex_unlock(&LOCK_user_locks);

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->proc_info=0;
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  return !error ? 1 : 0;
}


/*
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  Release a user level lock.
  Return:
    1 if lock released
    0 if lock wasn't held
    (SQL) NULL if no such lock
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*/

longlong Item_func_release_lock::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
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  User_level_lock *ull;
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  longlong result;
  if (!res || !res->length())
  {
    null_value=1;
    return 0;
  }
  null_value=0;

  result=0;
  pthread_mutex_lock(&LOCK_user_locks);
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  if (!(ull= ((User_level_lock*) hash_search(&hash_user_locks,
                                             (const byte*) res->ptr(),
                                             res->length()))))
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  {
    null_value=1;
  }
  else
  {
    if (ull->locked && pthread_equal(pthread_self(),ull->thread))
    {
      result=1;					// Release is ok
      item_user_lock_release(ull);
      current_thd->ull=0;
    }
  }
  pthread_mutex_unlock(&LOCK_user_locks);
  return result;
}


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longlong Item_func_last_insert_id::val_int()
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{
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  THD *thd= current_thd;
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  DBUG_ASSERT(fixed == 1);
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  if (arg_count)
  {
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    longlong value= args[0]->val_int();
    thd->insert_id(value);
    null_value= args[0]->null_value;
    return value;                       // Avoid side effect of insert_id()
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  }
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  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
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  return thd->last_insert_id_used ? thd->current_insert_id : thd->insert_id();
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}

/* This function is just used to test speed of different functions */

longlong Item_func_benchmark::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  char buff[MAX_FIELD_WIDTH];
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  String tmp(buff,sizeof(buff), &my_charset_bin);
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  THD *thd=current_thd;

  for (ulong loop=0 ; loop < loop_count && !thd->killed; loop++)
  {
    switch (args[0]->result_type()) {
    case REAL_RESULT:
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      (void) args[0]->val_real();
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      break;
    case INT_RESULT:
      (void) args[0]->val_int();
      break;
    case STRING_RESULT:
      (void) args[0]->val_str(&tmp);
      break;
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    case ROW_RESULT:
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    default:
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      // This case should never be chosen
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      DBUG_ASSERT(0);
      return 0;
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    }
  }
  return 0;
}

3345

3346 3347
void Item_func_benchmark::print(String *str)
{
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  str->append(STRING_WITH_LEN("benchmark("));
3349
  char buffer[20];
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  // my_charset_bin is good enough for numbers
  String st(buffer, sizeof(buffer), &my_charset_bin);
  st.set((ulonglong)loop_count, &my_charset_bin);
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  str->append(st);
  str->append(',');
  args[0]->print(str);
  str->append(')');
}

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/* This function is just used to create tests with time gaps */

longlong Item_func_sleep::val_int()
{
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  THD *thd= current_thd;
  struct timespec abstime;
  pthread_cond_t cond;
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  int error;
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  DBUG_ASSERT(fixed == 1);
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  double time= args[0]->val_real();
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  set_timespec_nsec(abstime, (ulonglong)(time * ULL(1000000000)));

  pthread_cond_init(&cond, NULL);
  pthread_mutex_lock(&LOCK_user_locks);

  thd->mysys_var->current_mutex= &LOCK_user_locks;
  thd->mysys_var->current_cond=  &cond;

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  error= 0;
  while (!thd->killed)
  {
    error= pthread_cond_timedwait(&cond, &LOCK_user_locks, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
    error= 0;
  }
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  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond=  0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  pthread_mutex_unlock(&LOCK_user_locks);
  pthread_cond_destroy(&cond);

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  return test(!error); 		// Return 1 killed
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}


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#define extra_size sizeof(double)

static user_var_entry *get_variable(HASH *hash, LEX_STRING &name,
				    bool create_if_not_exists)
{
  user_var_entry *entry;

  if (!(entry = (user_var_entry*) hash_search(hash, (byte*) name.str,
					      name.length)) &&
      create_if_not_exists)
  {
    uint size=ALIGN_SIZE(sizeof(user_var_entry))+name.length+1+extra_size;
    if (!hash_inited(hash))
      return 0;
    if (!(entry = (user_var_entry*) my_malloc(size,MYF(MY_WME))))
      return 0;
    entry->name.str=(char*) entry+ ALIGN_SIZE(sizeof(user_var_entry))+
      extra_size;
    entry->name.length=name.length;
    entry->value=0;
    entry->length=0;
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    entry->update_query_id=0;
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    entry->collation.set(NULL, DERIVATION_IMPLICIT);
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    entry->unsigned_flag= 0;
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    /*
      If we are here, we were called from a SET or a query which sets a
      variable. Imagine it is this:
      INSERT INTO t SELECT @a:=10, @a:=@a+1.
      Then when we have a Item_func_get_user_var (because of the @a+1) so we
      think we have to write the value of @a to the binlog. But before that,
      we have a Item_func_set_user_var to create @a (@a:=10), in this we mark
      the variable as "already logged" (line below) so that it won't be logged
      by Item_func_get_user_var (because that's not necessary).
    */
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    entry->used_query_id=current_thd->query_id;
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    entry->type=STRING_RESULT;
    memcpy(entry->name.str, name.str, name.length+1);
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    if (my_hash_insert(hash,(byte*) entry))
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    {
      my_free((char*) entry,MYF(0));
      return 0;
    }
  }
  return entry;
}

3447
/*
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  When a user variable is updated (in a SET command or a query like
  SELECT @a:= ).
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*/
3451

3452
bool Item_func_set_user_var::fix_fields(THD *thd, Item **ref)
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{
3454
  DBUG_ASSERT(fixed == 0);
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  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
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  if (Item_func::fix_fields(thd, ref) ||
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      !(entry= get_variable(&thd->user_vars, name, 1)))
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    return TRUE;
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  /* 
     Remember the last query which updated it, this way a query can later know
     if this variable is a constant item in the query (it is if update_query_id
     is different from query_id).
  */
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  entry->update_query_id= thd->query_id;
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  /*
    As it is wrong and confusing to associate any 
    character set with NULL, @a should be latin2
    after this query sequence:

      SET @a=_latin2'string';
      SET @a=NULL;

    I.e. the second query should not change the charset
    to the current default value, but should keep the 
    original value assigned during the first query.
    In order to do it, we don't copy charset
    from the argument if the argument is NULL
    and the variable has previously been initialized.
  */
3480 3481
  null_item= (args[0]->type() == NULL_ITEM);
  if (!entry->collation.collation || !null_item)
3482 3483
    entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
  collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
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  cached_result_type= args[0]->result_type();
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  return FALSE;
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}


void
Item_func_set_user_var::fix_length_and_dec()
{
  maybe_null=args[0]->maybe_null;
  max_length=args[0]->max_length;
  decimals=args[0]->decimals;
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  collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
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}

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/*
  Set value to user variable.

  SYNOPSYS
    update_hash()
    entry    - pointer to structure representing variable
    set_null - should we set NULL value ?
    ptr      - pointer to buffer with new value
    length   - length of new value
    type     - type of new value
    cs       - charset info for new value
    dv       - derivation for new value
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    unsigned_arg - indiates if a value of type INT_RESULT is unsigned
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  RETURN VALUE
    False - success, True - failure
*/

static bool
update_hash(user_var_entry *entry, bool set_null, void *ptr, uint length,
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            Item_result type, CHARSET_INFO *cs, Derivation dv,
            bool unsigned_arg)
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{
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  if (set_null)
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  {
    char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
    if (entry->value && entry->value != pos)
      my_free(entry->value,MYF(0));
3527 3528
    entry->value= 0;
    entry->length= 0;
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  }
  else
  {
3532 3533
    if (type == STRING_RESULT)
      length++;					// Store strings with end \0
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    if (length <= extra_size)
    {
      /* Save value in value struct */
      char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
      if (entry->value != pos)
      {
	if (entry->value)
	  my_free(entry->value,MYF(0));
	entry->value=pos;
      }
    }
    else
    {
      /* Allocate variable */
      if (entry->length != length)
      {
	char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
	if (entry->value == pos)
	  entry->value=0;
	if (!(entry->value=(char*) my_realloc(entry->value, length,
					      MYF(MY_ALLOW_ZERO_PTR))))
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	  return 1;
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      }
    }
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    if (type == STRING_RESULT)
    {
      length--;					// Fix length change above
      entry->value[length]= 0;			// Store end \0
    }
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    memcpy(entry->value,ptr,length);
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    if (type == DECIMAL_RESULT)
      ((my_decimal*)entry->value)->fix_buffer_pointer();
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    entry->length= length;
3567
    entry->collation.set(cs, dv);
3568
    entry->unsigned_flag= unsigned_arg;
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  }
3570
  entry->type=type;
3571
  return 0;
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}
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3573

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bool
Item_func_set_user_var::update_hash(void *ptr, uint length, Item_result type,
3577 3578
                                    CHARSET_INFO *cs, Derivation dv
                                    bool unsigned_arg)
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{
3580 3581 3582 3583 3584 3585
  /*
    If we set a variable explicitely to NULL then keep the old
    result type of the variable
  */
  if ((null_value= args[0]->null_value) && null_item)
    type= entry->type;                          // Don't change type of item
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  if (::update_hash(entry, (null_value= args[0]->null_value),
3587
                    ptr, length, type, cs, dv, unsigned_arg))
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  {
    current_thd->fatal_error();     // Probably end of memory
    null_value= 1;
    return 1;
  }
  return 0;
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}


3597 3598
/* Get the value of a variable as a double */

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double user_var_entry::val_real(my_bool *null_value)
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{
3601 3602 3603 3604 3605 3606 3607 3608
  if ((*null_value= (value == 0)))
    return 0.0;

  switch (type) {
  case REAL_RESULT:
    return *(double*) value;
  case INT_RESULT:
    return (double) *(longlong*) value;
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  case DECIMAL_RESULT:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, (my_decimal *)value, &result);
    return result;
  }
3615
  case STRING_RESULT:
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    return my_atof(value);                      // This is null terminated
3617 3618 3619
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
3621
  return 0.0;					// Impossible
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}


3625 3626 3627
/* Get the value of a variable as an integer */

longlong user_var_entry::val_int(my_bool *null_value)
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{
3629 3630 3631 3632 3633 3634 3635 3636
  if ((*null_value= (value == 0)))
    return LL(0);

  switch (type) {
  case REAL_RESULT:
    return (longlong) *(double*) value;
  case INT_RESULT:
    return *(longlong*) value;
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  case DECIMAL_RESULT:
  {
    longlong result;
3640
    my_decimal2int(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, &result);
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    return result;
  }
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  case STRING_RESULT:
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  {
    int error;
    return my_strtoll10(value, (char**) 0, &error);// String is null terminated
  }
3648 3649 3650
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665
  return LL(0);					// Impossible
}


/* Get the value of a variable as a string */

String *user_var_entry::val_str(my_bool *null_value, String *str,
				uint decimals)
{
  if ((*null_value= (value == 0)))
    return (String*) 0;

  switch (type) {
  case REAL_RESULT:
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    str->set(*(double*) value, decimals, &my_charset_bin);
3667 3668
    break;
  case INT_RESULT:
3669 3670 3671 3672
    if (!unsigned_flag)
      str->set(*(longlong*) value, &my_charset_bin);
    else
      str->set(*(ulonglong*) value, &my_charset_bin);
3673
    break;
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  case DECIMAL_RESULT:
    my_decimal2string(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, 0, 0, str);
    break;
3677
  case STRING_RESULT:
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    if (str->copy(value, length, collation.collation))
3679
      str= 0;					// EOM error
3680 3681 3682
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
3684
  return(str);
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}

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3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713
/* Get the value of a variable as a decimal */

my_decimal *user_var_entry::val_decimal(my_bool *null_value, my_decimal *val)
{
  if ((*null_value= (value == 0)))
    return 0;

  switch (type) {
  case REAL_RESULT:
    double2my_decimal(E_DEC_FATAL_ERROR, *(double*) value, val);
    break;
  case INT_RESULT:
    int2my_decimal(E_DEC_FATAL_ERROR, *(longlong*) value, 0, val);
    break;
  case DECIMAL_RESULT:
    val= (my_decimal *)value;
    break;
  case STRING_RESULT:
    str2my_decimal(E_DEC_FATAL_ERROR, value, length, collation.collation, val);
    break;
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
  }
  return(val);
}

3714 3715
/*
  This functions is invoked on SET @variable or @variable:= expression.
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  Evaluate (and check expression), store results.
3717 3718 3719 3720 3721

  SYNOPSYS
    Item_func_set_user_var::check()

  NOTES
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    For now it always return OK. All problem with value evaluating
    will be caught by thd->net.report_error check in sql_set_variables().
3724 3725

  RETURN
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    FALSE OK.
3727 3728 3729 3730 3731 3732 3733 3734 3735 3736
*/

bool
Item_func_set_user_var::check()
{
  DBUG_ENTER("Item_func_set_user_var::check");

  switch (cached_result_type) {
  case REAL_RESULT:
  {
3737
    save_result.vreal= args[0]->val_real();
3738 3739 3740 3741 3742
    break;
  }
  case INT_RESULT:
  {
    save_result.vint= args[0]->val_int();
3743
    unsigned_flag= args[0]->unsigned_flag;
3744 3745 3746 3747 3748 3749 3750
    break;
  }
  case STRING_RESULT:
  {
    save_result.vstr= args[0]->val_str(&value);
    break;
  }
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  case DECIMAL_RESULT:
  {
    save_result.vdec= args[0]->val_decimal(&decimal_buff);
    break;
  }
3756 3757
  case ROW_RESULT:
  default:
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    // This case should never be chosen
3759 3760 3761
    DBUG_ASSERT(0);
    break;
  }
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  DBUG_RETURN(FALSE);
3763 3764
}

3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776

/*
  This functions is invoked on SET @variable or @variable:= expression.

  SYNOPSIS
    Item_func_set_user_var::update()

  NOTES
    We have to store the expression as such in the variable, independent of
    the value method used by the user

  RETURN
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    0	OK
3778 3779 3780 3781
    1	EOM Error

*/

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bool
Item_func_set_user_var::update()
{
3785 3786 3787 3788
  bool res;
  DBUG_ENTER("Item_func_set_user_var::update");
  LINT_INIT(res);

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  switch (cached_result_type) {
  case REAL_RESULT:
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  {
3792
    res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
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		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT, 0);
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    break;
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  }
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  case INT_RESULT:
3797
  {
3798
    res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
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                     INT_RESULT, &my_charset_bin, DERIVATION_IMPLICIT,
                     unsigned_flag);
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    break;
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  }
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  case STRING_RESULT:
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  {
3805
    if (!save_result.vstr)					// Null value
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      res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
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		       DERIVATION_IMPLICIT, 0);
3808
    else
3809 3810 3811
      res= update_hash((void*) save_result.vstr->ptr(),
		       save_result.vstr->length(), STRING_RESULT,
		       save_result.vstr->charset(),
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		       DERIVATION_IMPLICIT, 0);
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    break;
  }
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  case DECIMAL_RESULT:
  {
    if (!save_result.vdec)					// Null value
      res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
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                       DERIVATION_IMPLICIT);
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    else
      res= update_hash((void*) save_result.vdec,
                       sizeof(my_decimal), DECIMAL_RESULT,
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                       &my_charset_bin, DERIVATION_IMPLICIT);
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    break;
  }
3826
  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
    break;
  }
3832
  DBUG_RETURN(res);
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}


3836
double Item_func_set_user_var::val_real()
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3837
{
3838
  DBUG_ASSERT(fixed == 1);
3839
  check();
3840
  update();					// Store expression
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  return entry->val_real(&null_value);
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}

3844
longlong Item_func_set_user_var::val_int()
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3845
{
3846
  DBUG_ASSERT(fixed == 1);
3847
  check();
3848 3849
  update();					// Store expression
  return entry->val_int(&null_value);
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}

3852
String *Item_func_set_user_var::val_str(String *str)
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3853
{
3854
  DBUG_ASSERT(fixed == 1);
3855
  check();
3856 3857
  update();					// Store expression
  return entry->val_str(&null_value, str, decimals);
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}


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my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed == 1);
  check();
  update();					// Store expression
  return entry->val_decimal(&null_value, val);
}


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void Item_func_set_user_var::print(String *str)
{
3872
  str->append(STRING_WITH_LEN("(@"));
3873
  str->append(name.str, name.length);
3874
  str->append(STRING_WITH_LEN(":="));
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  args[0]->print(str);
  str->append(')');
}


3880 3881
void Item_func_set_user_var::print_as_stmt(String *str)
{
3882
  str->append(STRING_WITH_LEN("set @"));
3883
  str->append(name.str, name.length);
3884
  str->append(STRING_WITH_LEN(":="));
3885 3886 3887 3888 3889
  args[0]->print(str);
  str->append(')');
}


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String *
Item_func_get_user_var::val_str(String *str)
{
3893
  DBUG_ASSERT(fixed == 1);
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  DBUG_ENTER("Item_func_get_user_var::val_str");
3895
  if (!var_entry)
3896
    DBUG_RETURN((String*) 0);			// No such variable
3897
  DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
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}


3901
double Item_func_get_user_var::val_real()
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3902
{
3903
  DBUG_ASSERT(fixed == 1);
3904 3905
  if (!var_entry)
    return 0.0;					// No such variable
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  return (var_entry->val_real(&null_value));
}


my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
  if (!var_entry)
    return 0;
  return var_entry->val_decimal(&null_value, dec);
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}


longlong Item_func_get_user_var::val_int()
{
3921
  DBUG_ASSERT(fixed == 1);
3922 3923 3924
  if (!var_entry)
    return LL(0);				// No such variable
  return (var_entry->val_int(&null_value));
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}


3928
/*
3929 3930 3931 3932 3933 3934 3935 3936 3937 3938
  Get variable by name and, if necessary, put the record of variable 
  use into the binary log.
  
  SYNOPSIS
    get_var_with_binlog()
      thd        Current thread
      name       Variable name 
      out_entry  [out] variable structure or NULL. The pointer is set 
                 regardless of whether function succeeded or not.

3939 3940 3941 3942
  When a user variable is invoked from an update query (INSERT, UPDATE etc),
  stores this variable and its value in thd->user_var_events, so that it can be
  written to the binlog (will be written just before the query is written, see
  log.cc).
3943

3944
  RETURN
3945
    0  OK
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    1  Failed to put appropriate record into binary log
3947

3948 3949
*/

3950 3951
int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
                        LEX_STRING &name, user_var_entry **out_entry)
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{
3953
  BINLOG_USER_VAR_EVENT *user_var_event;
3954 3955
  user_var_entry *var_entry;
  var_entry= get_variable(&thd->user_vars, name, 0);
3956 3957

  if (!(opt_bin_log && is_update_query(sql_command)))
3958 3959 3960 3961
  {
    *out_entry= var_entry;
    return 0;
  }
3962 3963

  if (!var_entry)
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  {
3965
    /*
3966 3967 3968 3969
      If the variable does not exist, it's NULL, but we want to create it so
      that it gets into the binlog (if it didn't, the slave could be
      influenced by a variable of the same name previously set by another
      thread).
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      We create it like if it had been explicitly set with SET before.
      The 'new' mimics what sql_yacc.yy does when 'SET @a=10;'.
3972 3973 3974
      sql_set_variables() is what is called from 'case SQLCOM_SET_OPTION'
      in dispatch_command()). Instead of building a one-element list to pass to
      sql_set_variables(), we could instead manually call check() and update();
3975 3976
      this would save memory and time; but calling sql_set_variables() makes
      one unique place to maintain (sql_set_variables()). 
3977 3978 3979

      Manipulation with lex is necessary since free_underlaid_joins
      is going to release memory belonging to the main query.
3980 3981 3982
    */

    List<set_var_base> tmp_var_list;
3983 3984 3985
    LEX *sav_lex= thd->lex, lex_tmp;
    thd->lex= &lex_tmp;
    lex_start(thd, NULL, 0);
3986 3987
    tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                       new Item_null())));
3988 3989
    /* Create the variable */
    if (sql_set_variables(thd, &tmp_var_list))
3990 3991
    {
      thd->lex= sav_lex;
3992
      goto err;
3993 3994
    }
    thd->lex= sav_lex;
3995 3996 3997
    if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
      goto err;
  }
3998 3999
  else if (var_entry->used_query_id == thd->query_id ||
           mysql_bin_log.is_query_in_union(thd, var_entry->used_query_id))
4000 4001 4002 4003 4004 4005 4006 4007 4008
  {
    /* 
       If this variable was already stored in user_var_events by this query
       (because it's used in more than one place in the query), don't store
       it.
    */
    *out_entry= var_entry;
    return 0;
  }
4009 4010 4011 4012

  uint size;
  /*
    First we need to store value of var_entry, when the next situation
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    appears:
4014 4015
    > set @a:=1;
    > insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
4016 4017 4018 4019 4020 4021
    We have to write to binlog value @a= 1.
    
    We allocate the user_var_event on user_var_events_alloc pool, not on
    the this-statement-execution pool because in SPs user_var_event objects 
    may need to be valid after current [SP] statement execution pool is
    destroyed.
4022
  */
4023 4024 4025
  size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;
  if (!(user_var_event= (BINLOG_USER_VAR_EVENT *)
        alloc_root(thd->user_var_events_alloc, size)))
4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037
    goto err;
  
  user_var_event->value= (char*) user_var_event +
    ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT));
  user_var_event->user_var_event= var_entry;
  user_var_event->type= var_entry->type;
  user_var_event->charset_number= var_entry->collation.collation->number;
  if (!var_entry->value)
  {
    /* NULL value*/
    user_var_event->length= 0;
    user_var_event->value= 0;
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  }
4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
  else
  {
    user_var_event->length= var_entry->length;
    memcpy(user_var_event->value, var_entry->value,
           var_entry->length);
  }
  /* Mark that this variable has been used by this query */
  var_entry->used_query_id= thd->query_id;
  if (insert_dynamic(&thd->user_var_events, (gptr) &user_var_event))
    goto err;
4049 4050 4051
  
  *out_entry= var_entry;
  return 0;
4052

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err:
4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065
  *out_entry= var_entry;
  return 1;
}


void Item_func_get_user_var::fix_length_and_dec()
{
  THD *thd=current_thd;
  int error;
  maybe_null=1;
  decimals=NOT_FIXED_DEC;
  max_length=MAX_BLOB_WIDTH;
4066

4067
  error= get_var_with_binlog(thd, thd->lex->sql_command, name, &var_entry);
4068 4069

  if (var_entry)
4070
  {
4071
    collation.set(var_entry->collation);
4072 4073 4074
    switch (var_entry->type) {
    case REAL_RESULT:
      max_length= DBL_DIG + 8;
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      break;
4076 4077
    case INT_RESULT:
      max_length= MAX_BIGINT_WIDTH;
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      decimals=0;
4079 4080 4081 4082
      break;
    case STRING_RESULT:
      max_length= MAX_BLOB_WIDTH;
      break;
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    case DECIMAL_RESULT:
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      max_length= DECIMAL_MAX_STR_LENGTH;
      decimals= DECIMAL_MAX_SCALE;
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      break;
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    case ROW_RESULT:                            // Keep compiler happy
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    default:
      DBUG_ASSERT(0);
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      break;
4091 4092
    }
  }
4093
  else
4094 4095
  {
    collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
4096
    null_value= 1;
4097
  }
4098

4099 4100
  if (error)
    thd->fatal_error();
4101

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  return;
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}


4106
bool Item_func_get_user_var::const_item() const
4107
{
4108
  return (!var_entry || current_thd->query_id != var_entry->update_query_id);
4109
}
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enum Item_result Item_func_get_user_var::result_type() const
{
  user_var_entry *entry;
  if (!(entry = (user_var_entry*) hash_search(&current_thd->user_vars,
					      (byte*) name.str,
					      name.length)))
    return STRING_RESULT;
  return entry->type;
}

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void Item_func_get_user_var::print(String *str)
{
4125
  str->append(STRING_WITH_LEN("(@"));
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  str->append(name.str,name.length);
  str->append(')');
}

4130

4131
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
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{
  /* Assume we don't have rtti */
  if (this == item)
    return 1;					// Same item is same.
  /* Check if other type is also a get_user_var() object */
  if (item->type() != FUNC_ITEM ||
4138
      ((Item_func*) item)->functype() != functype())
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    return 0;
  Item_func_get_user_var *other=(Item_func_get_user_var*) item;
  return (name.length == other->name.length &&
	  !memcmp(name.str, other->name.str, name.length));
}


4146
bool Item_func_get_user_var::set_value(THD *thd,
4147
                                       sp_rcontext */*ctx*/, Item **it)
4148
{
4149
  Item_func_set_user_var *suv= new Item_func_set_user_var(get_name(), *it);
4150 4151 4152 4153
  /*
    Item_func_set_user_var is not fixed after construction, call
    fix_fields().
  */
4154
  return (!suv || suv->fix_fields(thd, it) || suv->check() || suv->update());
4155 4156 4157
}


4158
bool Item_user_var_as_out_param::fix_fields(THD *thd, Item **ref)
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4159 4160
{
  DBUG_ASSERT(fixed == 0);
4161
  if (Item::fix_fields(thd, ref) ||
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      !(entry= get_variable(&thd->user_vars, name, 1)))
    return TRUE;
  entry->type= STRING_RESULT;
  /*
    Let us set the same collation which is used for loading
    of fields in LOAD DATA INFILE.
    (Since Item_user_var_as_out_param is used only there).
  */
  entry->collation.set(thd->variables.collation_database);
  entry->update_query_id= thd->query_id;
  return FALSE;
}


void Item_user_var_as_out_param::set_null_value(CHARSET_INFO* cs)
{
  if (::update_hash(entry, TRUE, 0, 0, STRING_RESULT, cs,
                    DERIVATION_IMPLICIT))
    current_thd->fatal_error();			// Probably end of memory
}


void Item_user_var_as_out_param::set_value(const char *str, uint length,
                                           CHARSET_INFO* cs)
{
  if (::update_hash(entry, FALSE, (void*)str, length, STRING_RESULT, cs,
                    DERIVATION_IMPLICIT))
    current_thd->fatal_error();			// Probably end of memory
}


double Item_user_var_as_out_param::val_real()
{
  DBUG_ASSERT(0);
  return 0.0;
}


longlong Item_user_var_as_out_param::val_int()
{
  DBUG_ASSERT(0);
  return 0;
}


String* Item_user_var_as_out_param::val_str(String *str)
{
  DBUG_ASSERT(0);
  return 0;
}


my_decimal* Item_user_var_as_out_param::val_decimal(my_decimal *decimal_buffer)
{
  DBUG_ASSERT(0);
  return 0;
}


void Item_user_var_as_out_param::print(String *str)
{
  str->append('@');
  str->append(name.str,name.length);
}


4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239
Item_func_get_system_var::
Item_func_get_system_var(sys_var *var_arg, enum_var_type var_type_arg,
                       LEX_STRING *component_arg, const char *name_arg,
                       size_t name_len_arg)
  :var(var_arg), var_type(var_type_arg), component(*component_arg)
{
  /* set_name() will allocate the name */
  set_name(name_arg, name_len_arg, system_charset_info);
}


bool
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4240
Item_func_get_system_var::fix_fields(THD *thd, Item **ref)
4241
{
4242
  Item *item;
4243
  DBUG_ENTER("Item_func_get_system_var::fix_fields");
4244

4245 4246 4247 4248 4249
  /*
    Evaluate the system variable and substitute the result (a basic constant)
    instead of this item. If the variable can not be evaluated,
    the error is reported in sys_var::item().
  */
4250
  if (!(item= var->item(thd, var_type, &component)))
4251 4252 4253 4254 4255 4256 4257 4258
    DBUG_RETURN(1);                             // Impossible
  item->set_name(name, 0, system_charset_info); // don't allocate a new name
  thd->change_item_tree(ref, item);

  DBUG_RETURN(0);
}


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longlong Item_func_inet_aton::val_int()
{
4261
  DBUG_ASSERT(fixed == 1);
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4262 4263 4264 4265 4266
  uint byte_result = 0;
  ulonglong result = 0;			// We are ready for 64 bit addresses
  const char *p,* end;
  char c = '.'; // we mark c to indicate invalid IP in case length is 0
  char buff[36];
4267
  int dot_count= 0;
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4268

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4269
  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
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4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285
  if (!(s = args[0]->val_str(&tmp)))		// If null value
    goto err;
  null_value=0;

  end= (p = s->ptr()) + s->length();
  while (p < end)
  {
    c = *p++;
    int digit = (int) (c - '0');		// Assume ascii
    if (digit >= 0 && digit <= 9)
    {
      if ((byte_result = byte_result * 10 + digit) > 255)
	goto err;				// Wrong address
    }
    else if (c == '.')
    {
4286
      dot_count++;
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4287 4288 4289 4290 4291 4292 4293
      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
4294
  {
4295 4296 4297 4298 4299 4300
    /*
      Handle short-forms addresses according to standard. Examples:
      127		-> 0.0.0.127
      127.1		-> 127.0.0.1
      127.2.1		-> 127.2.0.1
    */
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4301
    switch (dot_count) {
4302 4303
    case 1: result<<= 8; /* Fall through */
    case 2: result<<= 8; /* Fall through */
4304
    }
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4305
    return (result << 8) + (ulonglong) byte_result;
4306
  }
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4307 4308 4309 4310 4311 4312

err:
  null_value=1;
  return 0;
}

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4313

4314
void Item_func_match::init_search(bool no_order)
4315
{
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4316
  DBUG_ENTER("Item_func_match::init_search");
4317 4318

  /* Check if init_search() has been called before */
4319
  if (ft_handler)
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4320
    DBUG_VOID_RETURN;
4321

4322
  if (key == NO_SUCH_KEY)
4323 4324
  {
    List<Item> fields;
4325
    fields.push_back(new Item_string(" ",1, cmp_collation.collation));
4326 4327
    for (uint i=1; i < arg_count; i++)
      fields.push_back(args[i]);
4328
    concat=new Item_func_concat_ws(fields);
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4329 4330 4331
    /*
      Above function used only to get value and do not need fix_fields for it:
      Item_string - basic constant
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4332 4333
      fields - fix_fields() was already called for this arguments
      Item_func_concat_ws - do not need fix_fields() to produce value
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4334 4335
    */
    concat->quick_fix_field();
4336
  }
4337

4338 4339
  if (master)
  {
4340 4341
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
4342 4343
    ft_handler=master->ft_handler;
    join_key=master->join_key;
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4344
    DBUG_VOID_RETURN;
4345 4346
  }

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4347
  String *ft_tmp= 0;
4348

4349
  // MATCH ... AGAINST (NULL) is meaningless, but possible
4350
  if (!(ft_tmp=key_item()->val_str(&value)))
4351
  {
4352 4353
    ft_tmp= &value;
    value.set("",0,cmp_collation.collation);
4354 4355
  }

4356 4357
  if (ft_tmp->charset() != cmp_collation.collation)
  {
4358
    uint dummy_errors;
4359
    search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
4360
                      cmp_collation.collation, &dummy_errors);
4361
    ft_tmp= &search_value;
4362 4363
  }

4364 4365
  if (join_key && !no_order)
    flags|=FT_SORTED;
4366
  ft_handler=table->file->ft_init_ext(flags, key, ft_tmp);
4367 4368 4369

  if (join_key)
    table->file->ft_handler=ft_handler;
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4370 4371

  DBUG_VOID_RETURN;
4372 4373
}

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4374

4375
bool Item_func_match::fix_fields(THD *thd, Item **ref)
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4376
{
4377
  DBUG_ASSERT(fixed == 0);
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4378
  Item *item;
4379
  LINT_INIT(item);				// Safe as arg_count is > 1
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4380

4381 4382 4383
  maybe_null=1;
  join_key=0;

4384 4385 4386 4387 4388
  /*
    const_item is assumed in quite a bit of places, so it would be difficult
    to remove;  If it would ever to be removed, this should include
    modifications to find_best and auto_close as complement to auto_init code
    above.
4389
   */
4390
  if (Item_func::fix_fields(thd, ref) ||
4391
      !args[0]->const_during_execution())
4392 4393
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
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4394
    return TRUE;
4395
  }
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4396

4397 4398
  const_item_cache=0;
  for (uint i=1 ; i < arg_count ; i++)
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4399
  {
4400
    item=args[i];
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4401
    if (item->type() == Item::REF_ITEM)
4402 4403
      args[i]= item= *((Item_ref *)item)->ref;
    if (item->type() != Item::FIELD_ITEM)
4404
      key=NO_SUCH_KEY;
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4405
  }
4406 4407
  /*
    Check that all columns come from the same table.
4408
    We've already checked that columns in MATCH are fields so
4409 4410 4411
    PARAM_TABLE_BIT can only appear from AGAINST argument.
  */
  if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
4412
    key=NO_SUCH_KEY;
4413

4414
  if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
4415 4416
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
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4417
    return TRUE;
4418
  }
4419
  table=((Item_field *)item)->field->table;
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4420
  if (!(table->file->table_flags() & HA_CAN_FULLTEXT))
4421
  {
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4422
    my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0));
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4423
    return 1;
4424
  }
4425
  table->fulltext_searched=1;
4426 4427
  return agg_arg_collations_for_comparison(cmp_collation,
                                           args+1, arg_count-1, 0);
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4428
}
4429

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4430 4431 4432
bool Item_func_match::fix_index()
{
  Item_field *item;
4433
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
4434
  uint max_cnt=0, mkeys=0, i;
4435

4436
  if (key == NO_SUCH_KEY)
4437
    return 0;
4438 4439 4440
  
  if (!table) 
    goto err;
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4441

4442
  for (keynr=0 ; keynr < table->s->keys ; keynr++)
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4443
  {
4444
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
4445
        (table->keys_in_use_for_query.is_set(keynr)))
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4446
    {
4447
      ft_to_key[fts]=keynr;
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4448 4449 4450 4451 4452 4453
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
4454
    goto err;
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4455

4456
  for (i=1; i < arg_count; i++)
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4457
  {
4458
    item=(Item_field*)args[i];
4459
    for (keynr=0 ; keynr < fts ; keynr++)
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4460
    {
4461
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
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4462 4463 4464 4465 4466
      uint key_parts=ft_key->key_parts;

      for (uint part=0 ; part < key_parts ; part++)
      {
	if (item->field->eq(ft_key->key_part[part].field))
4467
	  ft_cnt[keynr]++;
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4468 4469 4470 4471
      }
    }
  }

4472
  for (keynr=0 ; keynr < fts ; keynr++)
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4473
  {
4474
    if (ft_cnt[keynr] > max_cnt)
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4475
    {
4476
      mkeys=0;
4477 4478
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4479 4480
      continue;
    }
4481
    if (max_cnt && ft_cnt[keynr] == max_cnt)
4482 4483
    {
      mkeys++;
4484 4485
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4486
      continue;
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4487 4488 4489
    }
  }

4490
  for (keynr=0 ; keynr <= mkeys ; keynr++)
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4491
  {
4492 4493
    // partial keys doesn't work
    if (max_cnt < arg_count-1 ||
4494
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
4495
      continue;
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4496

4497
    key=ft_to_key[keynr];
4498

4499 4500 4501
    return 0;
  }

4502
err:
4503
  if (flags & FT_BOOL)
4504
  {
4505
    key=NO_SUCH_KEY;
4506 4507
    return 0;
  }
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4508 4509
  my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
             ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
4510
  return 1;
4511 4512
}

4513

4514
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
4515
{
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4516 4517
  if (item->type() != FUNC_ITEM ||
      ((Item_func*)item)->functype() != FT_FUNC ||
4518
      flags != ((Item_func_match*)item)->flags)
4519 4520 4521 4522 4523
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
4524
      key_item()->eq(ifm->key_item(), binary_cmp))
4525
    return 1;
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4526 4527 4528 4529

  return 0;
}

4530

4531
double Item_func_match::val_real()
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4532
{
4533
  DBUG_ASSERT(fixed == 1);
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4534
  DBUG_ENTER("Item_func_match::val");
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4535
  if (ft_handler == NULL)
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4536
    DBUG_RETURN(-1.0);
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4537

4538
  if (key != NO_SUCH_KEY && table->null_row) /* NULL row from an outer join */
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    return 0.0;

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  if (join_key)
  {
    if (table->file->ft_handler)
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4544
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
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4545 4546 4547
    join_key=0;
  }

4548
  if (key == NO_SUCH_KEY)
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4549
  {
4550 4551
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
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4552 4553 4554
      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
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4555 4556
  }
  else
4557 4558
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
                                                   table->record[0], 0));
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4559 4560
}

4561 4562
void Item_func_match::print(String *str)
{
4563
  str->append(STRING_WITH_LEN("(match "));
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4564
  print_args(str, 1);
4565
  str->append(STRING_WITH_LEN(" against ("));
4566
  args[0]->print(str);
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4567
  if (flags & FT_BOOL)
4568
    str->append(STRING_WITH_LEN(" in boolean mode"));
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4569
  else if (flags & FT_EXPAND)
4570 4571
    str->append(STRING_WITH_LEN(" with query expansion"));
  str->append(STRING_WITH_LEN("))"));
4572
}
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4573

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4574 4575
longlong Item_func_bit_xor::val_int()
{
4576
  DBUG_ASSERT(fixed == 1);
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4577 4578
  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
4579
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
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4580 4581 4582 4583
    return 0;
  return (longlong) (arg1 ^ arg2);
}

4584

4585 4586 4587 4588
/***************************************************************************
  System variables
****************************************************************************/

4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605
/*
  Return value of an system variable base[.name] as a constant item

  SYNOPSIS
    get_system_var()
    thd			Thread handler
    var_type		global / session
    name		Name of base or system variable
    component		Component.

  NOTES
    If component.str = 0 then the variable name is in 'name'

  RETURN
    0	error
    #	constant item
*/
4606

4607 4608 4609

Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
		     LEX_STRING component)
4610
{
4611 4612 4613
  sys_var *var;
  LEX_STRING *base_name, *component_name;

4614 4615 4616 4617 4618 4619 4620 4621 4622 4623
  if (component.str)
  {
    base_name= &component;
    component_name= &name;
  }
  else
  {
    base_name= &name;
    component_name= &component;			// Empty string
  }
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4624

4625
  if (!(var= find_sys_var(base_name->str, base_name->length)))
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    return 0;
4627 4628 4629 4630
  if (component.str)
  {
    if (!var->is_struct())
    {
4631
      my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
4632 4633 4634
      return 0;
    }
  }
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4635
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
4636

4637 4638
  set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);

4639
  return new Item_func_get_system_var(var, var_type, component_name,
4640
                                      NULL, 0);
4641 4642 4643
}


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4644 4645
/*
  Check a user level lock.
4646 4647 4648 4649 4650 4651 4652 4653

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
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4654 4655
*/

4656
longlong Item_func_is_free_lock::val_int()
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4657
{
4658
  DBUG_ASSERT(fixed == 1);
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4659
  String *res=args[0]->val_str(&value);
4660
  User_level_lock *ull;
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4661 4662

  null_value=0;
4663
  if (!res || !res->length())
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  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
4670
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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4671 4672 4673 4674 4675 4676
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
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4677

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SCRUM  
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4678 4679
longlong Item_func_is_used_lock::val_int()
{
4680
  DBUG_ASSERT(fixed == 1);
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4681
  String *res=args[0]->val_str(&value);
4682
  User_level_lock *ull;
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SCRUM  
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4683 4684 4685 4686 4687 4688

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
4689
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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4690 4691 4692 4693 4694 4695 4696 4697 4698
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}

4699

4700 4701 4702 4703 4704 4705 4706 4707 4708
longlong Item_func_row_count::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->row_count_func;
}


4709 4710 4711
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg, sp_name *name)
  :Item_func(), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4712
{
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  maybe_null= 1;
4714
  m_name->init_qname(current_thd);
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  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE));
4716 4717
}

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4719 4720 4721 4722
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg,
                           sp_name *name, List<Item> &list)
  :Item_func(list), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4723
{
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  maybe_null= 1;
4725
  m_name->init_qname(current_thd);
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  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE));
4727 4728
}

4729 4730 4731 4732 4733 4734 4735 4736
void
Item_func_sp::cleanup()
{
  if (result_field)
  {
    delete result_field;
    result_field= NULL;
  }
4737
  m_sp= NULL;
4738 4739
  Item_func::cleanup();
}
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4740

4741 4742 4743
const char *
Item_func_sp::func_name() const
{
4744
  THD *thd= current_thd;
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  /* Calculate length to avoid reallocation of string for sure */
4746 4747 4748 4749
  uint len= ((m_name->m_db.length +
              m_name->m_name.length)*2 + //characters*quoting
             2 +                         // ` and `
             1 +                         // .
4750 4751
             1 +                         // end of string
             ALIGN_SIZE(1));             // to avoid String reallocation
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  String qname((char *)alloc_root(thd->mem_root, len), len,
4753
               system_charset_info);
4754

4755 4756 4757 4758 4759
  qname.length(0);
  append_identifier(thd, &qname, m_name->m_db.str, m_name->m_db.length);
  qname.append('.');
  append_identifier(thd, &qname, m_name->m_name.str, m_name->m_name.length);
  return qname.ptr();
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}

4762

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Field *
Item_func_sp::sp_result_field(void) const
{
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  Field *field;
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  DBUG_ENTER("Item_func_sp::sp_result_field");
4768 4769 4770 4771
  DBUG_PRINT("info", ("sp: %s, flags: %x, level: %lu",
                      (m_sp ? "YES" : "NO"),
                      (m_sp ? m_sp->m_flags : (uint)0),
                      (m_sp ? m_sp->m_recursion_level : (ulong)0)));
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  if (!m_sp)
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  {
4775 4776 4777
    THD *thd= current_thd;
    if (!(m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                &thd->sp_func_cache, TRUE)))
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    {
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      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
      DBUG_RETURN(0);
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    }
  }
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  if (!dummy_table->s)
  {
    char *empty_name= (char *) "";
    TABLE_SHARE *share;
4787
    dummy_table->s= share= &dummy_table->share_not_to_be_used;
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    dummy_table->alias = empty_name;
    dummy_table->maybe_null = maybe_null;
    dummy_table->in_use= current_thd;
4791
    dummy_table->copy_blobs= TRUE;
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    share->table_cache_key = empty_name;
    share->table_name = empty_name;
  }
4795 4796 4797
  if (!(field= m_sp->create_result_field(max_length, name, dummy_table)))
    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

4798
  DBUG_RETURN(field);
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}


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/*
  Execute function & store value in field

  RETURN
   0  value <> NULL
   1  value =  NULL  or error
*/

4810
bool
4811 4812
Item_func_sp::execute(Field **flp)
{
4813
  THD *thd= current_thd;
4814
  Field *f;
4815 4816 4817 4818 4819 4820

  /*
    Get field in virtual tmp table to store result. Create the field if
    invoked first time.
  */
  
4821 4822
  if (!(f= *flp))
  {
4823 4824
    if (!(*flp= f= sp_result_field()))
    {
4825 4826 4827
      /* Error set by sp_result_field() */
      null_value= 1;
      return TRUE;
4828 4829 4830
    }

    f->move_field((f->pack_length() > sizeof(result_buf)) ?
4831 4832 4833 4834
                  sql_alloc(f->pack_length()) : result_buf);
    f->null_ptr= (uchar *)&null_value;
    f->null_bit= 1;
  }
4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849

  /* Execute function and store the return value in the field. */

  if (execute_impl(thd, f))
  {
    null_value= 1;
    context->process_error(thd);
    return TRUE;
  }

  /* Check that the field (the value) is not NULL. */

  null_value= f->is_null();

  return null_value;
4850 4851 4852
}


4853 4854
bool
Item_func_sp::execute_impl(THD *thd, Field *return_value_fld)
4855
{
4856
  bool err_status= TRUE;
4857
  Sub_statement_state statement_state;
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4858
  Security_context *save_security_ctx= thd->security_ctx, *save_ctx_func;
4859

4860 4861
  DBUG_ENTER("Item_func_sp::execute_impl");

4862 4863 4864 4865 4866 4867 4868 4869
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (context->security_ctx)
  {
    /* Set view definer security context */
    thd->security_ctx= context->security_ctx;
  }
#endif
  if (find_and_check_access(thd, EXECUTE_ACL, &save_ctx_func))
4870
    goto error;
4871

4872 4873 4874 4875 4876
  /*
    Disable the binlogging if this is not a SELECT statement. If this is a
    SELECT, leave binlogging on, so execute_function() code writes the
    function call into binlog.
  */
4877
  thd->reset_sub_statement_state(&statement_state, SUB_STMT_FUNCTION);
4878
  err_status= m_sp->execute_function(thd, args, arg_count, return_value_fld);
4879
  thd->restore_sub_statement_state(&statement_state);
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4880

4881 4882
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  sp_restore_security_context(thd, save_ctx_func);
4883
error:
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4884
  thd->security_ctx= save_security_ctx;
4885 4886 4887
#else
error:
#endif
4888
  DBUG_RETURN(err_status);
4889 4890
}

4891

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4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907
void
Item_func_sp::make_field(Send_field *tmp_field)
{
  Field *field;
  DBUG_ENTER("Item_func_sp::make_field");
  if ((field= sp_result_field()))
  {
    field->make_field(tmp_field);
    delete field;
    DBUG_VOID_RETURN;
  }
  init_make_field(tmp_field, MYSQL_TYPE_VARCHAR);  
  DBUG_VOID_RETURN;
}


4908 4909
enum enum_field_types
Item_func_sp::field_type() const
4910
{
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4911
  Field *field;
4912
  DBUG_ENTER("Item_func_sp::field_type");
4913

4914 4915
  if (result_field)
    DBUG_RETURN(result_field->type());
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4916
  if ((field= sp_result_field()))
4917
  {
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4918 4919 4920
    enum_field_types result= field->type();
    delete field;
    DBUG_RETURN(result);
4921
  }
4922
  DBUG_RETURN(MYSQL_TYPE_VARCHAR);
4923 4924
}

4925

4926 4927
Item_result
Item_func_sp::result_type() const
4928
{
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4929
  Field *field;
4930 4931
  DBUG_ENTER("Item_func_sp::result_type");
  DBUG_PRINT("info", ("m_sp = %p", m_sp));
4932

4933 4934
  if (result_field)
    DBUG_RETURN(result_field->result_type());
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4935
  if ((field= sp_result_field()))
4936
  {
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4937 4938 4939
    Item_result result= field->result_type();
    delete field;
    DBUG_RETURN(result);
4940
  }
4941
  DBUG_RETURN(STRING_RESULT);
4942 4943 4944 4945 4946
}

void
Item_func_sp::fix_length_and_dec()
{
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4947
  Field *field;
4948 4949
  DBUG_ENTER("Item_func_sp::fix_length_and_dec");

4950 4951 4952
  if (result_field)
  {
    decimals= result_field->decimals();
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    max_length= result_field->field_length;
4954
    collation.set(result_field->charset());
4955 4956 4957
    DBUG_VOID_RETURN;
  }

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  if (!(field= sp_result_field()))
4959 4960
  {
    context->process_error(current_thd);
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4961
    DBUG_VOID_RETURN;
4962
  }
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  decimals= field->decimals();
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4964
  max_length= field->field_length;
4965
  collation.set(field->charset());
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4966
  maybe_null= 1;
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  delete field;
4968 4969
  DBUG_VOID_RETURN;
}
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4970 4971


4972 4973 4974
longlong Item_func_found_rows::val_int()
{
  DBUG_ASSERT(fixed == 1);
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4975
  return current_thd->found_rows();
4976
}
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4977

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4978

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Field *
Item_func_sp::tmp_table_field(TABLE *t_arg)
{
4982
  Field *field= 0;
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4983 4984 4985
  DBUG_ENTER("Item_func_sp::tmp_table_field");

  if (m_sp)
4986
    field= m_sp->create_result_field(max_length, (const char*) name, t_arg);
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4987
  
4988 4989
  if (!field) 
    field= Item_func::tmp_table_field(t_arg);
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4990

4991
  if (!field)
4992 4993
    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

4994
  DBUG_RETURN(field);
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4995
}
4996

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4997

4998
/*
4999
  Find the function and check access rights to the function
5000 5001

  SYNOPSIS
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5002 5003
    find_and_check_access()
    thd           thread handler
5004
    want_access   requested access
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5005
    save          backup of security context
5006 5007

  RETURN
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5008 5009
    FALSE    Access granted
    TRUE     Requested access can't be granted or function doesn't exists
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5010
	     In this case security context is not changed and *save = 0
5011 5012 5013 5014 5015

  NOTES
    Checks if requested access to function can be granted to user.
    If function isn't found yet, it searches function first.
    If function can't be found or user don't have requested access
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5016
    error is raised.
5017 5018
    If security context sp_ctx is provided and access can be granted then
    switch back to previous context isn't performed.
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5019 5020
    In case of access error or if context is not provided then
    find_and_check_access() switches back to previous security context.
5021
*/
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5022

5023
bool
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5024
Item_func_sp::find_and_check_access(THD *thd, ulong want_access,
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5025
                                    Security_context **save)
5026
{
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5027 5028 5029
  bool res= TRUE;

  *save= 0;                                     // Safety if error
5030 5031
  if (! m_sp && ! (m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                         &thd->sp_func_cache, TRUE)))
5032 5033 5034 5035 5036
  {
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
    goto error;
  }

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5037
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5038
  if (check_routine_access(thd, want_access,
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5039
			   m_sp->m_db.str, m_sp->m_name.str, 0, FALSE))
5040 5041
    goto error;

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5042
  sp_change_security_context(thd, m_sp, save);
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5043 5044 5045 5046 5047 5048 5049 5050 5051 5052
  /*
    If we changed context to run as another user, we need to check the
    access right for the new context again as someone may have deleted
    this person the right to use the procedure

    TODO:
      Cache if the definer has the right to use the object on the first
      usage and only reset the cache if someone does a GRANT statement
      that 'may' affect this.
  */
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5053
  if (*save &&
5054
      check_routine_access(thd, want_access,
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5055
			   m_sp->m_db.str, m_sp->m_name.str, 0, FALSE))
5056
  {
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5057 5058 5059
    sp_restore_security_context(thd, *save);
    *save= 0;                                   // Safety
    goto error;
5060 5061
  }
#endif
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5062 5063 5064
  res= FALSE;                                   // no error

error:
5065
  return res;
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5066
}
5067 5068 5069 5070 5071 5072 5073

bool
Item_func_sp::fix_fields(THD *thd, Item **ref)
{
  bool res;
  DBUG_ASSERT(fixed == 0);
  res= Item_func::fix_fields(thd, ref);
5074
  if (!res && thd->lex->view_prepare_mode)
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  {
5076 5077 5078 5079 5080 5081 5082 5083 5084 5085
    /*
      Here we check privileges of the stored routine only during view
      creation, in order to validate the view. A runtime check is perfomed
      in Item_func_sp::execute(), and this method is not called during
      context analysis. We do not need to restore the security context
      changed in find_and_check_access because all view structures created
      in CREATE VIEW are not used for execution.  Notice, that during view
      creation we do not infer into stored routine bodies and do not check
      privileges of its statements, which would probably be a good idea
      especially if the view has SQL SECURITY DEFINER and the used stored
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5086
      procedure has SQL SECURITY DEFINER
5087
    */
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5088 5089 5090 5091
    Security_context *save_ctx;
    if (!(res= find_and_check_access(thd, EXECUTE_ACL, &save_ctx)))
      sp_restore_security_context(thd, save_ctx);
  }
5092 5093
  return res;
}