item_func.cc 64.1 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 */

#ifdef __GNUC__
#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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#ifdef HAVE_COMPRESS
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#include <zlib.h>
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#endif
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static void my_coll_agg_error(DTCollation &c1, DTCollation &c2, const char *fname)
{
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  my_error(ER_CANT_AGGREGATE_2COLLATIONS,MYF(0),
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  	   c1.collation->name,c1.derivation_name(),
	   c2.collation->name,c2.derivation_name(),
	   fname);
}

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static void my_coll_agg_error(DTCollation &c1, 
			       DTCollation &c2,
			       DTCollation &c3,
			       const char *fname)
{
  my_error(ER_CANT_AGGREGATE_3COLLATIONS,MYF(0),
  	   c1.collation->name,c1.derivation_name(),
	   c2.collation->name,c2.derivation_name(),
	   c3.collation->name,c3.derivation_name(),
	   fname);
}

static void my_coll_agg_error(Item** args, uint ac, const char *fname)
{
  if (2 == ac)
    my_coll_agg_error(args[0]->collation, args[1]->collation, fname);
  else if (3 == ac)
    my_coll_agg_error(args[0]->collation,
		      args[1]->collation,
		      args[2]->collation,
		      fname);
  else
    my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),fname);
}

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bool Item_func::agg_arg_collations(DTCollation &c, Item **av, uint ac)
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{
  uint i;
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  c.set(av[0]->collation);
  for (i= 1; i < ac; i++)
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  {
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    if (c.aggregate(av[i]->collation))
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    {
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      my_coll_agg_error(av, ac, func_name());
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      return TRUE;
    }
  }
  return FALSE;
}

bool Item_func::agg_arg_collations_for_comparison(DTCollation &c, 
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						  Item **av, uint ac)
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{
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  if (agg_arg_collations(c, av, ac))
    return TRUE;
  
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  if (c.derivation == DERIVATION_NONE)
  {
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    my_coll_agg_error(av, ac, func_name());
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    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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Item_func::Item_func(List<Item> &list)
  :allowed_arg_cols(1)
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{
  arg_count=list.elements;
  if ((args=(Item**) sql_alloc(sizeof(Item*)*arg_count)))
  {
    uint i=0;
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    List_iterator_fast<Item> li(list);
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    Item *item;

    while ((item=li++))
    {
      args[i++]= item;
      with_sum_func|=item->with_sum_func;
    }
  }
  list.empty();					// Fields are used
}

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

  SYNOPSIS:
  fix_fields()
  thd		Thread object
  tables	List of all open tables involved in the query
  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
      used_table_cache  Set to union of the arguments used table

      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
  0	ok
  1	Got error.  Stored with my_error().
*/

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bool
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Item_func::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
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{
  Item **arg,**arg_end;
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  char buff[STACK_BUFF_ALLOC];			// Max argument in function
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  used_tables_cache=0;
  const_item_cache=1;

  if (thd && check_stack_overrun(thd,buff))
    return 0;					// Fatal error if flag is set!
  if (arg_count)
  {						// Print purify happy
    for (arg=args, arg_end=args+arg_count; arg != arg_end ; arg++)
    {
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      Item *item;
      /* We can't yet set item to *arg as fix_fields may change *arg */
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      if ((*arg)->fix_fields(thd, tables, arg) ||
	  (*arg)->check_cols(allowed_arg_cols))
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	return 1;				/* purecov: inspected */
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      item= *arg;
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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;
      used_tables_cache|=item->used_tables();
      const_item_cache&= item->const_item();
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    }
  }
  fix_length_and_dec();
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  fixed= 1;
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  return 0;
}

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void Item_func::set_outer_resolving()
{
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
      (*arg)->set_outer_resolving();
  }
}

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void Item_func::split_sum_func(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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  {
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    Item *item=* arg;
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    if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
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      item->split_sum_func(ref_pointer_array, fields);
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    else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
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    {
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      uint el= fields.elements;
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      fields.push_front(item);
      ref_pointer_array[el]= item;
      *arg= new Item_ref(ref_pointer_array + el, 0, item->name);
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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;
}

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


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:
    if (max_length > 255)
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      res= new Field_blob(max_length, maybe_null, name, t_arg, charset());
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    else
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      res= new Field_string(max_length, maybe_null, name, t_arg, charset());
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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 choosen
    DBUG_ASSERT(0);
    break;
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  }
  return res;
}


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String *Item_real_func::val_str(String *str)
{
  double nr=val();
  if (null_value)
    return 0; /* purecov: inspected */
  else
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    str->set(nr,decimals,default_charset());
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  return str;
}


String *Item_num_func::val_str(String *str)
{
  if (hybrid_type == INT_RESULT)
  {
    longlong nr=val_int();
    if (null_value)
      return 0; /* purecov: inspected */
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    else if (!unsigned_flag)
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      str->set(nr,default_charset());
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    else
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      str->set((ulonglong) nr,default_charset());
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  }
  else
  {
    double nr=val();
    if (null_value)
      return 0; /* purecov: inspected */
    else
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      str->set(nr,decimals,default_charset());
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  }
  return str;
}


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

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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)
{
  longlong nr=val_int();
  if (null_value)
    return 0;
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  else if (!unsigned_flag)
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    str->set(nr,default_charset());
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  else
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    str->set((ulonglong) nr,default_charset());
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  return str;
}

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/*
  Change from REAL_RESULT (default) to INT_RESULT if both arguments are
  integers
*/
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void Item_num_op::find_num_type(void)
{
  if (args[0]->result_type() == INT_RESULT &&
      args[1]->result_type() == INT_RESULT)
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  {
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    hybrid_type=INT_RESULT;
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    unsigned_flag=args[0]->unsigned_flag | args[1]->unsigned_flag;
  }
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}

String *Item_num_op::val_str(String *str)
{
  if (hybrid_type == INT_RESULT)
  {
    longlong nr=val_int();
    if (null_value)
      return 0; /* purecov: inspected */
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    else if (!unsigned_flag)
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      str->set(nr,default_charset());
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    else
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      str->set((ulonglong) nr,default_charset());
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  }
  else
  {
    double nr=val();
    if (null_value)
      return 0; /* purecov: inspected */
    else
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      str->set(nr,decimals,default_charset());
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  }
  return str;
}


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

longlong Item_func_plus::val_int()
{
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  if (hybrid_type == INT_RESULT)
  {
    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;
  }
  return (longlong) Item_func_plus::val();
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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::val()
{
  double value=args[0]->val() - args[1]->val();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
  return value;
}

longlong Item_func_minus::val_int()
{
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  if (hybrid_type == INT_RESULT)
  {
    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;
  }
  return (longlong) Item_func_minus::val();
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}

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double Item_func_mul::val()
{
  double value=args[0]->val()*args[1]->val();
  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0; /* purecov: inspected */
  return value;
}

longlong Item_func_mul::val_int()
{
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  if (hybrid_type == INT_RESULT)
  {
    longlong value=args[0]->val_int()*args[1]->val_int();
    if ((null_value=args[0]->null_value || args[1]->null_value))
      return 0; /* purecov: inspected */
    return value;
  }
  return (longlong) Item_func_mul::val();
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}


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

longlong Item_func_div::val_int()
{
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  if (hybrid_type == INT_RESULT)
  {
    longlong value=args[0]->val_int();
    longlong val2=args[1]->val_int();
    if ((null_value= val2 == 0 || args[0]->null_value || args[1]->null_value))
      return 0;
    return value/val2;
  }
  return (longlong) Item_func_div::val();
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}

void Item_func_div::fix_length_and_dec()
{
  decimals=max(args[0]->decimals,args[1]->decimals)+2;
  max_length=args[0]->max_length - args[0]->decimals + decimals;
  uint tmp=float_length(decimals);
  set_if_smaller(max_length,tmp);
  maybe_null=1;
}

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/* Integer division */
longlong Item_func_int_div::val_int()
{
  longlong value=args[0]->val_int();
  longlong val2=args[1]->val_int();
  if ((null_value= val2 == 0 || args[0]->null_value || args[1]->null_value))
    return 0;
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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()
{
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  find_num_type();
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  max_length=args[0]->max_length - args[0]->decimals;
  maybe_null=1;
}


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double Item_func_mod::val()
{
  double value= floor(args[0]->val()+0.5);
  double val2=floor(args[1]->val()+0.5);
  if ((null_value=val2 == 0.0 || args[0]->null_value || args[1]->null_value))
    return 0.0; /* purecov: inspected */
  return fmod(value,val2);
}

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

void Item_func_mod::fix_length_and_dec()
{
  max_length=args[1]->max_length;
  decimals=0;
  maybe_null=1;
  find_num_type();
}


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

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

void Item_func_neg::fix_length_and_dec()
{
  decimals=args[0]->decimals;
  max_length=args[0]->max_length;
  hybrid_type= args[0]->result_type() == INT_RESULT ? INT_RESULT : REAL_RESULT;
}

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

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

void Item_func_abs::fix_length_and_dec()
{
  decimals=args[0]->decimals;
  max_length=args[0]->max_length;
  hybrid_type= args[0]->result_type() == INT_RESULT ? INT_RESULT : REAL_RESULT;
}

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/* Gateway to natural LOG function */
double Item_func_ln::val()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0;
  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()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || value <= 0.0)))
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    return 0.0;
  if (arg_count == 2)
  {
    double value2= args[1]->val();
    if ((null_value=(args[1]->null_value || value2 <= 0.0 || value == 1.0)))
      return 0.0;
    return log(value2) / log(value);
  }
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  return log(value);
}

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double Item_func_log2::val()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0;
  return log(value) / log(2.0);
}

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double Item_func_log10::val()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0; /* purecov: inspected */
  return log10(value);
}

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

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

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

// Trigonometric functions

double Item_func_acos::val()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(acos(value));
}

double Item_func_asin::val()
{
  double value=args[0]->val();
  if ((null_value=(args[0]->null_value || (value < -1.0 || value > 1.0))))
    return 0.0;
  return fix_result(asin(value));
}

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

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

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

double Item_func_tan::val()
{
  double value=args[0]->val();
  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()
{
  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()
{
  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()
{
  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;
}

longlong Item_func_ceiling::val_int()
{
  double value=args[0]->val();
  null_value=args[0]->null_value;
  return (longlong) ceil(value);
}

longlong Item_func_floor::val_int()
{
  double value=args[0]->val();
  null_value=args[0]->null_value;
  return (longlong) floor(value);
}

void Item_func_round::fix_length_and_dec()
{
  max_length=args[0]->max_length;
  decimals=args[0]->decimals;
  if (args[1]->const_item())
  {
    int tmp=(int) args[1]->val_int();
    if (tmp < 0)
      decimals=0;
    else
      decimals=tmp;
  }
}

double Item_func_round::val()
{
  double value=args[0]->val();
  int dec=(int) args[1]->val_int();
  uint abs_dec=abs(dec);
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  double tmp;
  /*
    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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  if ((null_value=args[0]->null_value || args[1]->null_value))
    return 0.0;
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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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}


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void Item_func_rand::fix_length_and_dec()
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{
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  decimals=NOT_FIXED_DEC; 
  max_length=float_length(decimals);
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  if (arg_count)
  {					// Only use argument once in query
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    uint32 tmp= (uint32) (args[0]->val_int());
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    if ((rand= (struct rand_struct*) sql_alloc(sizeof(*rand))))
      randominit(rand,(uint32) (tmp*0x10001L+55555555L),
		 (uint32) (tmp*0x10000001L));
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  }
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  else
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  {
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    THD *thd= current_thd;
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    /*
      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.
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      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
    */
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    thd->rand_used=1;
    thd->rand_saved_seed1=thd->rand.seed1;
    thd->rand_saved_seed2=thd->rand.seed2;
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    rand= &thd->rand;
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  }
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}


double Item_func_rand::val()
{
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  return my_rnd(rand);
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}

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


double Item_func_units::val()
{
  double value=args[0]->val();
  if ((null_value=args[0]->null_value))
    return 0;
  return value*mul+add;
}


void Item_func_min_max::fix_length_and_dec()
{
  decimals=0;
  max_length=0;
  maybe_null=1;
  cmp_type=args[0]->result_type();
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  for (uint i=0 ; i < arg_count ; i++)
  {
    if (max_length < args[i]->max_length)
      max_length=args[i]->max_length;
    if (decimals < args[i]->decimals)
      decimals=args[i]->decimals;
    if (!args[i]->maybe_null)
      maybe_null=0;
    cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
  }
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  if (cmp_type == STRING_RESULT)
    agg_arg_collations_for_comparison(collation, args, arg_count);
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}


String *Item_func_min_max::val_str(String *str)
{
  switch (cmp_type) {
  case INT_RESULT:
  {
    longlong nr=val_int();
    if (null_value)
      return 0;
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    else if (!unsigned_flag)
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      str->set(nr,default_charset());
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    else
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      str->set((ulonglong) nr,default_charset());
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    return str;
  }
  case REAL_RESULT:
  {
    double nr=val();
    if (null_value)
      return 0; /* purecov: inspected */
    else
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      str->set(nr,decimals,default_charset());
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    return str;
  }
  case STRING_RESULT:
  {
    String *res;
    LINT_INIT(res);
    null_value=1;
    for (uint i=0; i < arg_count ; i++)
    {
      if (null_value)
      {
	res=args[i]->val_str(str);
	null_value=args[i]->null_value;
      }
      else
      {
	String *res2;
	res2= args[i]->val_str(res == str ? &tmp_value : str);
	if (res2)
	{
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	  int cmp= sortcmp(res,res2,charset());
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	  if ((cmp_sign < 0 ? cmp : -cmp) < 0)
	    res=res2;
	}
      }
    }
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    res->set_charset(charset());
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    return res;
  }
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  case ROW_RESULT:
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  default:
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    // This case should never be choosen
    DBUG_ASSERT(0);
    return 0;

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  }
  return 0;					// Keep compiler happy
}


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


longlong Item_func_min_max::val_int()
{
  longlong value=0;
  null_value=1;
  for (uint i=0; i < arg_count ; i++)
  {
    if (null_value)
    {
      value=args[i]->val_int();
      null_value=args[i]->null_value;
    }
    else
    {
      longlong tmp=args[i]->val_int();
      if (!args[i]->null_value && (tmp < value ? cmp_sign : -cmp_sign) > 0)
	value=tmp;
    }
  }
  return value;
}

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#ifdef HAVE_COMPRESS
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longlong Item_func_crc32::val_int()
{
  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) crc32(0L, (Bytef*)res->ptr(), res->length());
}

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longlong Item_func_uncompressed_length::val_int()
{
  String *res= args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
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  if (res->is_empty()) return 0;
  return uint4korr(res->c_ptr()) & 0x3FFFFFFF;
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}

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

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

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longlong Item_func_coercibility::val_int()
{
  if (args[0]->null_value)
  {
    null_value= 1;
    return 0;
  }
  null_value= 0;
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  return (longlong) args[0]->derivation();
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}
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void Item_func_locate::fix_length_and_dec()
{
  maybe_null=0; max_length=11;
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  agg_arg_collations_for_comparison(cmp_collation, args, 2);
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}

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longlong Item_func_locate::val_int()
{
  String *a=args[0]->val_str(&value1);
  String *b=args[1]->val_str(&value2);
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  bool binary_cmp= (cmp_collation.collation->state & MY_CS_BINSORT) ? 1 : 0;
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  if (!a || !b)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
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  uint start=0;
#ifdef USE_MB
  uint start0=0;
#endif
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  if (arg_count == 3)
  {
    start=(uint) args[2]->val_int()-1;
#ifdef USE_MB
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    if (use_mb(cmp_collation.collation))
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    {
      start0=start;
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      if (!binary_cmp)
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        start=a->charpos(start);
    }
#endif
    if (start > a->length() || start+b->length() > a->length())
      return 0;
  }
  if (!b->length())				// Found empty string at start
    return (longlong) (start+1);
#ifdef USE_MB
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  if (use_mb(cmp_collation.collation) && !binary_cmp)
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  {
    const char *ptr=a->ptr()+start;
    const char *search=b->ptr();
    const char *strend = ptr+a->length();
    const char *end=strend-b->length()+1;
    const char *search_end=search+b->length();
    register  uint32 l;
    while (ptr < end)
    {
      if (*ptr == *search)
      {
        register char *i,*j;
        i=(char*) ptr+1; j=(char*) search+1;
        while (j != search_end)
          if (*i++ != *j++) goto skipp;
        return (longlong) start0+1;
      }
  skipp:
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      if ((l=my_ismbchar(cmp_collation.collation,ptr,strend)))
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	ptr+=l;
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      else ++ptr;
      ++start0;
    }
    return 0;
  }
#endif /* USE_MB */
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  return (longlong) (binary_cmp ? a->strstr(*b,start) :
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		     (a->strstr_case(*b,start)))+1;
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}


longlong Item_func_field::val_int()
{
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  if (cmp_type == STRING_RESULT)
  {
    String *field;
    if (!(field=item->val_str(&value)))
      return 0;					// -1 if null ?
    for (uint i=0 ; i < arg_count ; i++)
    {
      String *tmp_value=args[i]->val_str(&tmp);
      if (tmp_value && field->length() == tmp_value->length() &&
	  !sortcmp(field,tmp_value,cmp_collation.collation))
        return (longlong) (i+1);
    }
  }
  else if (cmp_type == INT_RESULT)
  {
    longlong val= item->val_int();
    for (uint i=0; i < arg_count ; i++)
    {
      if (val == args[i]->val_int())
 	return (longlong) (i+1);
    }
  }
  else
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  {
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    double val= item->val();
    for (uint i=0; i < arg_count ; i++)
    {
      if (val == args[i]->val())
 	return (longlong) (i+1);
    }
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  }
  return 0;
}

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void Item_func_field::fix_length_and_dec()
{
  maybe_null=0; max_length=3;
  used_tables_cache|= item->used_tables();
  const_item_cache&=  item->const_item();
  with_sum_func= with_sum_func || item->with_sum_func;
  
  cmp_type= item->result_type();
  for (uint i=0; i < arg_count ; i++)
    cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
  
  if (cmp_type == STRING_RESULT)
  {
    cmp_collation.set(item->collation);
    for (uint i=0 ; i < arg_count ; i++)
    {
      if (cmp_collation.aggregate(args[i]->collation))
      {
	my_error(ER_CANT_AGGREGATE_NCOLLATIONS,MYF(0),func_name());
	return;
      }
    }
  }
}

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void Item_func_field::split_sum_func(Item **ref_pointer_array,
				     List<Item> &fields)
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{
  if (item->with_sum_func && item->type() != SUM_FUNC_ITEM)
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    item->split_sum_func(ref_pointer_array, fields);
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  else if (item->used_tables() || item->type() == SUM_FUNC_ITEM)
  {
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    uint el= fields.elements;
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    fields.push_front(item);
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    ref_pointer_array[el]= item;
    item= new Item_ref(ref_pointer_array + el, 0, item->name);
  }
  Item_func::split_sum_func(ref_pointer_array, fields);
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}
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longlong Item_func_ascii::val_int()
{
  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()
{
  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)
      {
	enum_value=find_enum(((Field_enum*) field)->typelib,find->ptr(),
			     find->length());
	enum_bit=0;
	if (enum_value)
	  enum_bit=LL(1) << (enum_value-1);
      }
    }
  }
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  agg_arg_collations_for_comparison(cmp_collation, args, 2);
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}

static const char separator=',';

longlong Item_func_find_in_set::val_int()
{
  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)
  {
    const char *f_pos=find->ptr();
    const char *f_end=f_pos+find->length();
    const char *str=buffer->ptr();
    const char *end=str+diff+1;
    const char *real_end=str+buffer->length();
    uint position=1;
    do
    {
      const char *pos= f_pos;
      while (pos != f_end)
      {
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	if (my_toupper(cmp_collation.collation,*str) != 
	    my_toupper(cmp_collation.collation,*pos))
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	  goto not_found;
	str++;
	pos++;
      }
      if (str == real_end || str[0] == separator)
	return (longlong) position;
  not_found:
      while (str < end && str[0] != separator)
	str++;
      position++;
    } while (++str <= end);
  }
  return 0;
}

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

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


bool
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udf_handler::fix_fields(THD *thd, TABLE_LIST *tables, Item_result_field *func,
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			uint arg_count, Item **arguments)
{
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  char buff[STACK_BUFF_ALLOC];			// Max argument in function
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  DBUG_ENTER("Item_udf_func::fix_fields");

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  if (thd)
  {
    if (check_stack_overrun(thd,buff))
      return 0;					// Fatal error flag is set!
  }
  else
    thd=current_thd;				// In WHERE / const clause
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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_printf_error(ER_CANT_FIND_UDF,ER(ER_CANT_FIND_UDF),MYF(0),u_d->name.str,
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		    errno);
    DBUG_RETURN(1);
  }
  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);
      DBUG_RETURN(1);
    }
    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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      Item *item= *arg;
      if (item->fix_fields(thd, tables, arg) || item->check_cols(1))
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	return 1;
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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
	the particular user definted function.
      */
      if (item->charset()->state & MY_CS_BINSORT)
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	func->set_charset(&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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    }
    if (!(buffers=new String[arg_count]) ||
	!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
	!(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(ALIGN_SIZE(sizeof(double))*arg_count)))
    {
      free_udf(u_d);
      DBUG_RETURN(1);
    }
  }
  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;
      f_args.lengths[i]=arguments[i]->max_length;
      f_args.maybe_null[i]=(char) arguments[i]->maybe_null;

      switch(arguments[i]->type()) {
      case Item::STRING_ITEM:			// Constant string !
      {
	String *res=arguments[i]->val_str((String *) 0);
	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:
	*((double*) to) = arguments[i]->val();
	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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    my_bool (*init)(UDF_INIT *, UDF_ARGS *, char *)=
      (my_bool (*)(UDF_INIT *, UDF_ARGS *,  char *))
      u_d->func_init;
    if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
    {
      my_printf_error(ER_CANT_INITIALIZE_UDF,ER(ER_CANT_INITIALIZE_UDF),MYF(0),
		      u_d->name,thd->net.last_error);
      free_udf(u_d);
      DBUG_RETURN(1);
    }
    func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
    func->maybe_null=initid.maybe_null;
    const_item_cache=initid.const_item;
    func->decimals=min(initid.decimals,31);
  }
  initialized=1;
  if (error)
  {
    my_printf_error(ER_CANT_INITIALIZE_UDF,ER(ER_CANT_INITIALIZE_UDF),MYF(0),
		    u_d->name, ER(ER_UNKNOWN_ERROR));
    DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}


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:
      {
	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:
      *((double*) to) = args[i]->val();
      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 choosen
      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)
{
  uchar is_null=0;
  ulong res_length;

  if (get_arguments())
    return 0;
  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;
      return 0;
    }
  }
  char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length, &is_null,
		&error);
  if (is_null || !res || error)			// The !res is for safety
  {
    return 0;
  }
  if (res == str->ptr())
  {
    str->length(res_length);
    return str;
  }
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  save_str->set(res, res_length, str->charset());
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  return save_str;
}



double Item_func_udf_float::val()
{
  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)
{
  double nr=val();
  if (null_value)
    return 0;					/* purecov: inspected */
  else
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    str->set(nr,decimals,default_charset());
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  return str;
}


longlong Item_func_udf_int::val_int()
{
  DBUG_ENTER("Item_func_udf_int::val_int");
  DBUG_PRINT("info",("result_type: %d  arg_count: %d",
		     args[0]->result_type(), arg_count));

  DBUG_RETURN(udf.val_int(&null_value));
}


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

/* 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)
{
  String *res=udf.val_str(str,&str_value);
  null_value = !res;
  return res;
}

#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;

class ULL
{
  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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  ULL(const char *key_arg,uint length, ulong id) 
    :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)
    {
      if (hash_insert(&hash_user_locks,(byte*) this))
      {
	my_free((gptr) key,MYF(0));
	key=0;
      }
    }
  }
  ~ULL()
  {
    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; }
  friend void item_user_lock_release(ULL *ull);
  friend char *ull_get_key(const ULL *ull,uint *length,my_bool not_used);
};

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

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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}

void item_user_lock_free(void)
{
  hash_free(&hash_user_locks);
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  pthread_mutex_destroy(&LOCK_user_locks);
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}

void item_user_lock_release(ULL *ull)
{
  ull->locked=0;
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  if (mysql_bin_log.is_open())
  {
    char buf[256];
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    const char *command="DO RELEASE_LOCK(\"";
    String tmp(buf,sizeof(buf), system_charset_info);
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    tmp.copy(command, strlen(command), tmp.charset());
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    tmp.append(ull->key,ull->key_length);
    tmp.append("\")");
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    Query_log_event qev(current_thd, tmp.ptr(), tmp.length(),1);
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    qev.error_code=0; // this query is always safe to run on slave
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    mysql_bin_log.write(&qev);
  }
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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()
{
  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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  LOCK_ACTIVE_MI;
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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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  UNLOCK_ACTIVE_MI;
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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;
  ULL* ull;
  struct timespec abstime;
  int lock_name_len,error=0;
  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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  */
  if (!(ull= ((ULL*) hash_search(&hash_user_locks,lock_name,
				 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 (!thd->killed &&
	 (error=pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime))
	 != ETIME && error != ETIMEDOUT && ull->locked) ;
  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()
{
  String *res=args[0]->val_str(&value);
  longlong timeout=args[1]->val_int();
  struct timespec abstime;
  THD *thd=current_thd;
  ULL *ull;
1903
  int error=0;
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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;
  }

  if (!(ull= ((ULL*) hash_search(&hash_user_locks,(byte*) res->ptr(),
				 res->length()))))
  {
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    ull=new ULL(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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  while (!thd->killed &&
	 (error=pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime))
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	 != ETIME && error != ETIMEDOUT && error != EINVAL && ull->locked) ;
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  if (thd->killed)
    error=EINTR;				// Return NULL
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  if (ull->locked)
  {
    if (!--ull->count)
      delete ull;				// Should never happen
    if (error != ETIME && error != ETIMEDOUT)
    {
      error=1;
      null_value=1;				// Return NULL
    }
  }
  else
  {
    ull->locked=1;
    ull->thread=thd->real_id;
    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;
}


/*
1983 1984 1985 1986 1987
  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()
{
  String *res=args[0]->val_str(&value);
  ULL *ull;
  longlong result;
  if (!res || !res->length())
  {
    null_value=1;
    return 0;
  }
  null_value=0;

  result=0;
  pthread_mutex_lock(&LOCK_user_locks);
  if (!(ull= ((ULL*) hash_search(&hash_user_locks,(const byte*) res->ptr(),
				 res->length()))))
  {
    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;
}


longlong Item_func_set_last_insert_id::val_int()
{
  longlong value=args[0]->val_int();
  current_thd->insert_id(value);
  null_value=args[0]->null_value;
  return value;
}

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

longlong Item_func_benchmark::val_int()
{
  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:
      (void) args[0]->val();
      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:
2052
    default:
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      // This case should never be choosen
      DBUG_ASSERT(0);
      return 0;
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    }
  }
  return 0;
}

2061

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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->used_query_id=current_thd->query_id;
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    entry->type=STRING_RESULT;
    memcpy(entry->name.str, name.str, name.length+1);
    if (hash_insert(hash,(byte*) entry))
    {
      my_free((char*) entry,MYF(0));
      return 0;
    }
  }
  return entry;
}


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bool Item_func_set_user_var::fix_fields(THD *thd, TABLE_LIST *tables,
					Item **ref)
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{
2101
  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
2102
  if (Item_func::fix_fields(thd, tables, ref) ||
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      !(entry= get_variable(&thd->user_vars, name, 1)))
    return 1;
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  entry->update_query_id=thd->query_id;
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  return 0;
}


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;
  cached_result_type=args[0]->result_type();
}

void Item_func_set_user_var::update_hash(void *ptr, uint length,
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					 Item_result type,
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					 CHARSET_INFO *cs,
2122
					 Derivation dv)
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{
  if ((null_value=args[0]->null_value))
  {
    char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
    if (entry->value && entry->value != pos)
      my_free(entry->value,MYF(0));
    entry->value=0;
    entry->length=0;
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    entry->collation.set(cs, dv);
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  }
  else
  {
    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))))
	  goto err;
      }
    }
    memcpy(entry->value,ptr,length);
    entry->length= length;
    entry->type=type;
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    entry->collation.set(cs, dv);
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  }
  return;

 err:
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  current_thd->fatal_error();			// Probably end of memory
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  null_value=1;
  return;
}


bool
Item_func_set_user_var::update()
{
  switch (cached_result_type) {
  case REAL_RESULT:
    (void) val();
    break;
  case INT_RESULT:
    (void) val_int();
    break;
  case STRING_RESULT:
2184
  {
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    char buffer[MAX_FIELD_WIDTH];
2186
    String tmp(buffer,sizeof(buffer),&my_charset_bin);
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    (void) val_str(&tmp);
    break;
  }
2190
  case ROW_RESULT:
2191
  default:
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    // This case should never be choosen
    DBUG_ASSERT(0);
    break;
  }
2196
  return current_thd->is_fatal_error;
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}


double
Item_func_set_user_var::val()
{
  double value=args[0]->val();
2204
  update_hash((void*) &value,sizeof(value), REAL_RESULT, 
2205
    &my_charset_bin, DERIVATION_NONE);
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  return value;
}

longlong
Item_func_set_user_var::val_int()
{
  longlong value=args[0]->val_int();
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  update_hash((void*) &value, sizeof(longlong), INT_RESULT,
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	      &my_charset_bin, DERIVATION_NONE);
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  return value;
}

String *
Item_func_set_user_var::val_str(String *str)
{
  String *res=args[0]->val_str(str);
  if (!res)					// Null value
2223
    update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin, DERIVATION_NONE);
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  else
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    update_hash((void*) res->ptr(), res->length(), STRING_RESULT,
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		res->charset(), args[0]->derivation());
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  return res;
}


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void Item_func_set_user_var::print(String *str)
{
  str->append('(');
  str->append(name.str,name.length);
  str->append(":=",2);
  args[0]->print(str);
  str->append(')');
}


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user_var_entry *Item_func_get_user_var::get_entry()
{
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  if (!var_entry  || ! var_entry->value)
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  {
    null_value=1;
    return 0;
  }
  null_value=0;
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  return var_entry;
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}


String *
Item_func_get_user_var::val_str(String *str)
{
  user_var_entry *entry=get_entry();
  if (!entry)
    return NULL;
  switch (entry->type) {
  case REAL_RESULT:
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    str->set(*(double*) entry->value,decimals, &my_charset_bin);
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    break;
  case INT_RESULT:
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    str->set(*(longlong*) entry->value, &my_charset_bin);
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    break;
  case STRING_RESULT:
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    if (str->copy(entry->value, entry->length, entry->collation.collation))
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    {
      null_value=1;
      return NULL;
    }
    break;
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  case ROW_RESULT:
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  default:
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    // This case should never be choosen
    DBUG_ASSERT(0);
    break;
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  }
  return str;
}


double Item_func_get_user_var::val()
{
  user_var_entry *entry=get_entry();
  if (!entry)
    return 0.0;
  switch (entry->type) {
  case REAL_RESULT:
    return *(double*) entry->value;
  case INT_RESULT:
    return (double) *(longlong*) entry->value;
  case STRING_RESULT:
    return atof(entry->value);			// This is null terminated
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  case ROW_RESULT:
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  default:
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    // This case should never be choosen
    DBUG_ASSERT(0);
    return 0; 
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  }
  return 0.0;					// Impossible
}


longlong Item_func_get_user_var::val_int()
{
  user_var_entry *entry=get_entry();
  if (!entry)
    return LL(0);
  switch (entry->type) {
  case REAL_RESULT:
    return (longlong) *(double*) entry->value;
  case INT_RESULT:
    return *(longlong*) entry->value;
  case STRING_RESULT:
    return strtoull(entry->value,NULL,10);	// String is null terminated
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  case ROW_RESULT:
2318
  default:
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    // This case should never be choosen
    DBUG_ASSERT(0);
    return 0;
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  }
  return LL(0);					// Impossible
}


void Item_func_get_user_var::fix_length_and_dec()
{
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  BINLOG_USER_VAR_EVENT *user_var_event;
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  THD *thd=current_thd;
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  maybe_null=1;
  decimals=NOT_FIXED_DEC;
  max_length=MAX_BLOB_WIDTH;
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  if ((var_entry= get_variable(&thd->user_vars, name, 0)))
  {
    if (opt_bin_log && is_update_query(thd->lex.sql_command) &&
	var_entry->used_query_id != thd->query_id)
    {
2340
      uint size;
2341
      /*
2342 2343
	First we need to store value of var_entry, when the next situation
	appers:
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        > set @a:=1;
	> insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
	We have to write to binlog value @a= 1;
      */
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      size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;      
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      if (!(user_var_event= (BINLOG_USER_VAR_EVENT *) thd->alloc(size)))
        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;
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      user_var_event->charset_number= var_entry->collation.collation->number;
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      if (!var_entry->value)
      {
	/* NULL value*/
	user_var_event->length= 0;
	user_var_event->value= 0;
      }
      else
      {
	user_var_event->length= var_entry->length;
	memcpy(user_var_event->value, var_entry->value,
	       var_entry->length);
      }
      var_entry->used_query_id= thd->query_id;
      if (insert_dynamic(&thd->user_var_events, (gptr) &user_var_event))
        goto err;
    }
  }
  return;
2375

2376
err:
2377
  thd->fatal_error();
2378
  return;
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}


2382
bool Item_func_get_user_var::const_item() const
2383 2384 2385
{
  return var_entry && current_thd->query_id != var_entry->update_query_id;
}
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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)
{
  str->append('@');
  str->append(name.str,name.length);
  str->append(')');
}

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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 ||
      ((Item_func*) item)->func_name() != func_name())
    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));
}


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longlong Item_func_inet_aton::val_int()
{
  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];

2430
  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
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  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 == '.')
    {
      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
    return (result << 8) + (ulonglong) byte_result;

err:
  null_value=1;
  return 0;
}

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2462
void Item_func_match::init_search(bool no_order)
2463
{
2464
  DBUG_ENTER("Item_func_match::init_search");
2465
  if (ft_handler)
2466
    DBUG_VOID_RETURN;
2467

2468
  if (key == NO_SUCH_KEY)
2469 2470 2471
    concat=new Item_func_concat_ws(new Item_string(" ",1,
						   default_charset_info),
				   fields);
2472

2473 2474
  if (master)
  {
2475 2476
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
2477 2478
    ft_handler=master->ft_handler;
    join_key=master->join_key;
2479
    DBUG_VOID_RETURN;
2480 2481
  }

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2482
  String *ft_tmp= 0;
2483
  char tmp1[FT_QUERY_MAXLEN];
2484
  String tmp2(tmp1,sizeof(tmp1),default_charset_info);
2485

2486
  // MATCH ... AGAINST (NULL) is meaningless, but possible
2487 2488
  if (!(ft_tmp=key_item()->val_str(&tmp2)))
  {
2489
    ft_tmp= &tmp2;
2490
    tmp2.set("",0,default_charset_info);
2491 2492
  }

2493
  ft_handler=table->file->ft_init_ext(mode, key,
2494 2495 2496
				      (byte*) ft_tmp->ptr(),
				      ft_tmp->length(),
				      join_key && !no_order);
2497 2498 2499

  if (join_key)
    table->file->ft_handler=ft_handler;
2500 2501

  DBUG_VOID_RETURN;
2502 2503
}

2504

2505
bool Item_func_match::fix_fields(THD *thd, TABLE_LIST *tlist, Item **ref)
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2506 2507 2508 2509
{
  List_iterator<Item> li(fields);
  Item *item;

2510 2511 2512
  maybe_null=1;
  join_key=0;

2513 2514 2515 2516 2517
  /*
    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.
2518
   */
2519
  if (Item_func::fix_fields(thd, tlist, ref) || !const_item())
2520 2521
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
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2522
    return 1;
2523
  }
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2524 2525 2526

  while ((item=li++))
  {
2527
    if (item->fix_fields(thd, tlist, li.ref()) || item->check_cols(1))
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2528 2529 2530 2531
      return 1;
    if (item->type() == Item::REF_ITEM)
      li.replace(item= *((Item_ref *)item)->ref);
    if (item->type() != Item::FIELD_ITEM || !item->used_tables())
2532
      key=NO_SUCH_KEY;
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2533 2534
    used_tables_cache|=item->used_tables();
  }
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2535
  /* check that all columns come from the same table */
2536
  if (my_count_bits(used_tables_cache) != 1)
2537
    key=NO_SUCH_KEY;
2538 2539
  const_item_cache=0;
  table=((Item_field *)fields.head())->field->table;
2540
  table->fulltext_searched=1;
2541 2542
  record=table->record[0];
  if (key == NO_SUCH_KEY && mode != FT_BOOL)
2543 2544
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
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2545
    return 1;
2546
  }
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Merge  
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2547

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2548 2549 2550
  return 0;
}

2551 2552 2553 2554 2555 2556 2557 2558 2559
void Item_func_match::set_outer_resolving()
{
  Item_real_func::set_outer_resolving();
  List_iterator<Item> li(fields);
  Item *item;
  while ((item= li++))
    item->set_outer_resolving();
}

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2560 2561
bool Item_func_match::fix_index()
{
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2562
  List_iterator_fast<Item> li(fields);
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2563
  Item_field *item;
2564
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
2565 2566
  uint max_cnt=0, mkeys=0;

2567
  if (key == NO_SUCH_KEY)
2568
    return 0;
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2569

2570
  for (keynr=0 ; keynr < table->keys ; keynr++)
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2571
  {
2572 2573
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
        (table->keys_in_use_for_query & (((key_map)1) << keynr)))
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2574
    {
2575
      ft_to_key[fts]=keynr;
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2576 2577 2578 2579 2580 2581
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
2582
    goto err;
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2583 2584 2585

  while ((item=(Item_field*)(li++)))
  {
2586
    for (keynr=0 ; keynr < fts ; keynr++)
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2587
    {
2588
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
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2589 2590 2591 2592 2593
      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))
2594
	  ft_cnt[keynr]++;
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2595 2596 2597 2598
      }
    }
  }

2599
  for (keynr=0 ; keynr < fts ; keynr++)
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2600
  {
2601
    if (ft_cnt[keynr] > max_cnt)
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2602
    {
2603
      mkeys=0;
2604 2605
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
2606 2607
      continue;
    }
2608
    if (max_cnt && ft_cnt[keynr] == max_cnt)
2609 2610
    {
      mkeys++;
2611 2612
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
2613
      continue;
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2614 2615 2616
    }
  }

2617
  for (keynr=0 ; keynr <= mkeys ; keynr++)
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2618
  {
2619 2620
    // for now, partial keys won't work. SerG
    if (max_cnt < fields.elements ||
2621
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
2622
      continue;
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2623

2624
    key=ft_to_key[keynr];
2625

2626 2627 2628
    return 0;
  }

2629 2630 2631
err:
  if (mode == FT_BOOL)
  {
2632
    key=NO_SUCH_KEY;
2633 2634
    return 0;
  }
2635
  my_printf_error(ER_FT_MATCHING_KEY_NOT_FOUND,
2636
		  ER(ER_FT_MATCHING_KEY_NOT_FOUND),MYF(0));
2637
  return 1;
2638 2639
}

2640

2641
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
2642
{
2643 2644
  if (item->type() != FUNC_ITEM ||
      func_name() != ((Item_func*)item)->func_name())
2645 2646 2647 2648 2649
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
2650
      key_item()->eq(ifm->key_item(), binary_cmp))
2651
    return 1;
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2652 2653 2654 2655

  return 0;
}

2656

2657 2658
double Item_func_match::val()
{
2659
  DBUG_ENTER("Item_func_match::val");
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2660
  if (ft_handler == NULL)
2661
    DBUG_RETURN(-1.0);
2662 2663 2664 2665

  if (join_key)
  {
    if (table->file->ft_handler)
2666
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
2667 2668 2669
    join_key=0;
  }

2670
  if (key == NO_SUCH_KEY)
2671
  {
2672 2673
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
2674 2675 2676
      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
2677 2678
  }
  else
2679
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler, record, 0));
2680 2681
}

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2682

2683 2684 2685 2686
longlong Item_func_bit_xor::val_int()
{
  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
2687
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
2688 2689 2690 2691
    return 0;
  return (longlong) (arg1 ^ arg2);
}

2692

2693 2694 2695 2696
/***************************************************************************
  System variables
****************************************************************************/

2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717
/*
  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
*/
  

Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
		     LEX_STRING component)
2718
{
2719 2720
  if (component.str == 0 &&
      !my_strcasecmp(system_charset_info, name.str, "VERSION"))
2721 2722 2723
    return new Item_string("@@VERSION", server_version,
			   (uint) strlen(server_version),
			   system_charset_info);
2724 2725 2726

  Item *item;
  sys_var *var;
2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *pos;
  LEX_STRING *base_name, *component_name;

  if (component.str)
  {
    base_name= &component;
    component_name= &name;
  }
  else
  {
    base_name= &name;
    component_name= &component;			// Empty string
  }
2740

2741
  if (!(var= find_sys_var(base_name->str, base_name->length)))
2742
    return 0;
2743 2744 2745 2746 2747 2748 2749 2750 2751
  if (component.str)
  {
    if (!var->is_struct())
    {
      net_printf(thd, ER_VARIABLE_IS_NOT_STRUCT, base_name->str);
      return 0;
    }
  }
  if (!(item=var->item(thd, var_type, component_name)))
2752
    return 0;					// Impossible
2753
  thd->lex.uncacheable();
2754 2755
  buff[0]='@';
  buff[1]='@';
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2756 2757 2758 2759 2760
  pos=buff+2;
  if (var_type == OPT_SESSION)
    pos=strmov(pos,"session.");
  else if (var_type == OPT_GLOBAL)
    pos=strmov(pos,"global.");
2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
  
  set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);
  set_if_smaller(base_name->length, MAX_SYS_VAR_LENGTH);

  if (component_name->str)
  {
    memcpy(pos, component_name->str, component_name->length);
    pos+= component_name->length;
    *pos++= '.';
  }
  memcpy(pos, base_name->str, base_name->length);
  pos+= base_name->length;

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2774
  // set_name() will allocate the name
2775
  item->set_name(buff,(uint) (pos-buff), system_charset_info);
2776
  return item;
2777
}
2778

2779

2780 2781
Item *get_system_var(THD *thd, enum_var_type var_type, const char *var_name,
		     uint length, const char *item_name)
2782 2783 2784
{
  Item *item;
  sys_var *var;
2785 2786 2787
  LEX_STRING null_lex_string;

  null_lex_string.str= 0;
2788 2789 2790

  var= find_sys_var(var_name, length);
  DBUG_ASSERT(var != 0);
2791
  if (!(item=var->item(thd, var_type, &null_lex_string)))
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2792
    return 0;						// Impossible
2793
  thd->lex.uncacheable();
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2794
  item->set_name(item_name, 0, system_charset_info);	// Will use original name
2795 2796 2797 2798
  return item;
}


2799 2800
/*
  Check a user level lock.
2801 2802 2803 2804 2805 2806 2807 2808

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
2809 2810
*/

2811
longlong Item_func_is_free_lock::val_int()
2812 2813 2814 2815 2816 2817 2818
{
  String *res=args[0]->val_str(&value);
  THD *thd=current_thd;
  ULL *ull;
  int error=0;

  null_value=0;
2819
  if (!res || !res->length())
2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832
  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
  ull= (ULL*) hash_search(&hash_user_locks,(byte*) res->ptr(),
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
2833

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longlong Item_func_is_used_lock::val_int()
{
  String *res=args[0]->val_str(&value);
  THD *thd=current_thd;
  ULL *ull;

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
  ull= (ULL*) hash_search(&hash_user_locks,(byte*) res->ptr(),
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}