item_func.cc 86.3 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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#include "sp_head.h"
#include "sp_rcontext.h"
#include "sp.h"
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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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static void my_coll_agg_error(DTCollation &c1, DTCollation &c2,
			      const char *fname)
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{
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  my_error(ER_CANT_AGGREGATE_2COLLATIONS, MYF(0),
           c1.collation->name, c1.derivation_name(),
           c2.collation->name, c2.derivation_name(),
           fname);
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}

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static void my_coll_agg_error(DTCollation &c1,
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			       DTCollation &c2,
			       DTCollation &c3,
			       const char *fname)
{
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  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);
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}

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

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

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bool Item_func::agg_arg_collations_for_comparison(DTCollation &c,
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						  Item **av, uint count,
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                                                  uint flags)
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{
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  return (agg_arg_collations(c, av, count, flags | MY_COLL_DISALLOW_NONE));
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}


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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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/* 
  Collect arguments' character sets together.
  We allow to apply automatic character set conversion in some cases.
  The conditions when conversion is possible are:
  - arguments A and B have different charsets
  - A wins according to coercibility rules
    (i.e. a column is stronger than a string constant,
     an explicit COLLATE clause is stronger than a column)
  - character set of A is either superset for character set of B,
    or B is a string constant which can be converted into the
    character set of A without data loss.
    
  If all of the above is true, then it's possible to convert
  B into the character set of A, and then compare according
  to the collation of A.
  
  For functions with more than two arguments:

    collect(A,B,C) ::= collect(collect(A,B),C)
*/

bool Item_func::agg_arg_charsets(DTCollation &coll,
                                 Item **args, uint nargs, uint flags)
{
  Item **arg, **last, *safe_args[2];
  if (agg_arg_collations(coll, args, nargs, flags))
    return TRUE;

  /*
    For better error reporting: save the first and the second argument.
    We need this only if the the number of args is 3 or 2:
    - for a longer argument list, "Illegal mix of collations"
      doesn't display each argument's characteristics.
    - if nargs is 1, then this error cannot happen.
  */
  if (nargs >=2 && nargs <= 3)
  {
    safe_args[0]= args[0];
    safe_args[1]= args[1];
  }

  THD *thd= current_thd;
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  Item_arena *arena, backup;
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  bool res= FALSE;
  /*
    In case we're in statement prepare, create conversion item
    in its memory: it will be reused on each execute.
  */
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  arena= thd->change_arena_if_needed(&backup);
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  for (arg= args, last= args + nargs; arg < last; arg++)
  {
    Item* conv;
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    uint32 dummy_offset;
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    if (!String::needs_conversion(0, coll.collation,
                                  (*arg)->collation.collation,
                                  &dummy_offset))
      continue;

    if (!(conv= (*arg)->safe_charset_converter(coll.collation)))
    {
      if (nargs >=2 && nargs <= 3)
      {
        /* restore the original arguments for better error message */
        args[0]= safe_args[0];
        args[1]= safe_args[1];
      }
      my_coll_agg_error(args, nargs, func_name());
      res= TRUE;
      break; // we cannot return here, we need to restore "arena".
    }
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    if ((*arg)->type() == FIELD_ITEM)
      ((Item_field *)(*arg))->no_const_subst= 1;
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    conv->fix_fields(thd, 0, &conv);
    *arg= conv;
  }
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  if (arena)
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    thd->restore_backup_item_arena(arena, &backup);
  return res;
}



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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;
  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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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
  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
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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, TABLE_LIST *tables, 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
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  char buff[STACK_BUFF_ALLOC];			// Max argument in function
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#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, 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, tables, arg)) ||
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	  (*arg)->check_cols(allowed_arg_cols))
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	return TRUE;				/* 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;
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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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    }
  }
  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(Item_cond_traverser traverser, 
			      void *argument,
			      traverse_order order)
{
  if (arg_count)
  {
    Item **arg,**arg_end;
    if (order == PREFIX) (traverser)(this, argument);
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
      (*arg)->traverse_cond(traverser, argument, order);
    }
  }
  if (order == POSTFIX) (traverser)(this, argument);
}

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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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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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  {
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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(thd, 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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      Item *new_item= new Item_ref(ref_pointer_array + el, 0, item->name);
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      new_item->collation.set(item->collation);
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      fields.push_front(item);
      ref_pointer_array[el]= item;
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      thd->change_item_tree(arg, new_item);
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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 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)
{
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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;
}


String *Item_num_func::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  if (hybrid_type == INT_RESULT)
  {
    longlong nr=val_int();
    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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  }
  else
  {
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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;
}


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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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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/*
  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)
{
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  DBUG_ASSERT(fixed == 1);
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  if (hybrid_type == INT_RESULT)
  {
    longlong nr=val_int();
    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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  }
  else
  {
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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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void Item_func_signed::print(String *str)
{
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  str->append("cast(", 5);
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  args[0]->print(str);
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  str->append(" as signed)", 11);
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}


void Item_func_unsigned::print(String *str)
{
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  str->append("cast(", 5);
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  args[0]->print(str);
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  str->append(" as unsigned)", 13);
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}


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double Item_func_plus::val_real()
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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))
    return 0.0;
  return value;
}

longlong Item_func_plus::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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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;
  }
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  return (longlong) Item_func_plus::val_real();
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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_real()
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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))
    return 0.0;
  return value;
}

longlong Item_func_minus::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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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;
  }
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  return (longlong) Item_func_minus::val_real();
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}

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double Item_func_mul::val_real()
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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))
    return 0.0; /* purecov: inspected */
  return value;
}

longlong Item_func_mul::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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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;
  }
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  return (longlong) Item_func_mul::val_real();
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}


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double Item_func_div::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;
  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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longlong Item_func_div::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  if (hybrid_type == INT_RESULT)
  {
    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;
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    if (val2 == 0)
    {
      signal_divide_by_null();
      return 0;
    }
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    return value/val2;
  }
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  return (longlong) Item_func_div::val_real();
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}

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void Item_func_div::fix_length_and_dec()
{
  decimals=max(args[0]->decimals,args[1]->decimals)+2;
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  set_if_smaller(decimals, NOT_FIXED_DEC);
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  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()
{
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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 (args[0]->null_value || args[1]->null_value)
    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()
{
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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_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))
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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);
}

longlong Item_func_mod::val_int()
{
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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; /* purecov: inspected */
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  if (val2 == 0)
  {
    signal_divide_by_null();
    return 0;
  }
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  return value % val2;
}

void Item_func_mod::fix_length_and_dec()
{
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  Item_num_op::fix_length_and_dec();
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}


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double Item_func_neg::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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  null_value=args[0]->null_value;
  return -value;
}

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longlong Item_func_neg::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  longlong value=args[0]->val_int();
  null_value=args[0]->null_value;
  return -value;
}

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void Item_func_neg::fix_length_and_dec()
{
  decimals=args[0]->decimals;
  max_length=args[0]->max_length;
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  hybrid_type= REAL_RESULT;
  if (args[0]->result_type() == INT_RESULT)
  {
    /*
      If this is in integer context keep the context as integer
      (This is how multiplication and other integer functions works)

      We must however do a special case in the case where the argument
      is a unsigned bigint constant as in this case the only safe
      number to convert in integer context is 9223372036854775808.
      (This is needed because the lex parser doesn't anymore handle
      signed integers)
    */
    if (args[0]->type() != INT_ITEM ||
	((ulonglong) ((Item_uint*) args[0])->value <=
	 (ulonglong) LONGLONG_MIN))
      hybrid_type= INT_RESULT;
  }
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}

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

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

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void Item_func_abs::fix_length_and_dec()
{
  decimals=args[0]->decimals;
  max_length=args[0]->max_length;
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  hybrid_type= REAL_RESULT;
  if (args[0]->result_type() == INT_RESULT)
  {
    hybrid_type= INT_RESULT;
    unsigned_flag= 1;
  }
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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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  double value= args[0]->val_real();
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  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_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 <= 0.0)))
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    return 0.0;
  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 || 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_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 <= 0.0)))
    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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  double value= args[0]->val_real();
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  if ((null_value=(args[0]->null_value || value <= 0.0)))
    return 0.0; /* purecov: inspected */
  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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  DBUG_ASSERT(fixed == 1);
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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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  DBUG_ASSERT(fixed == 1);
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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;
}

longlong Item_func_ceiling::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  double value= args[0]->val_real();
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  null_value=args[0]->null_value;
  return (longlong) ceil(value);
}

longlong Item_func_floor::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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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 (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
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      decimals=min(tmp,NOT_FIXED_DEC);
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  }
}

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double Item_func_round::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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  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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bool Item_func_rand::fix_fields(THD *thd, struct st_table_list *tables,
                                Item **ref)
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{
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  Item_real_func::fix_fields(thd, tables, ref);
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  used_tables_cache|= RAND_TABLE_BIT;
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  if (arg_count)
  {					// Only use argument once in query
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    /*
      Allocate rand structure once: we must use thd->current_arena
      to create rand in proper mem_root if it's a prepared statement or
      stored procedure.
    */
    if (!rand && !(rand= (struct rand_struct*)
                   thd->current_arena->alloc(sizeof(*rand))))
      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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  }
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  else
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  {
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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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  return FALSE;
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}

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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()
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{
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  DBUG_ASSERT(fixed == 1);
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  return my_rnd(rand);
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}

longlong Item_func_sign::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  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);
}


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double Item_func_units::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;
  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)
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    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV);
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}


String *Item_func_min_max::val_str(String *str)
{
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  DBUG_ASSERT(fixed == 1);
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  switch (cmp_type) {
  case INT_RESULT:
  {
    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;
  }
  case REAL_RESULT:
  {
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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;
  }
  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,collation.collation);
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	  if ((cmp_sign < 0 ? cmp : -cmp) < 0)
	    res=res2;
	}
      }
    }
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    if (res)					// If !NULL
      res->set_charset(collation.collation);
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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
}


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


longlong Item_func_min_max::val_int()
{
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  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;
}

longlong Item_func_length::val_int()
{
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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()
{
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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; /* 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()
{
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  DBUG_ASSERT(fixed == 1);
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  if (args[0]->null_value)
  {
    null_value= 1;
    return 0;
  }
  null_value= 0;
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  return (longlong) args[0]->collation.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_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV);
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}

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longlong Item_func_locate::val_int()
{
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  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;
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  uint start=0;
  uint start0=0;
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  my_match_t match;
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  if (arg_count == 3)
  {
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    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;
  }
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  if (!b->length())				// Found empty string at start
    return (longlong) (start+1);
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  if (!cmp_collation.collation->coll->instr(cmp_collation.collation,
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                                            a->ptr()+start, a->length()-start,
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                                            b->ptr(), b->length(),
                                            &match, 1))
    return 0;
  return (longlong) match.mblen + start0 + 1;
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}


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void Item_func_locate::print(String *str)
{
  str->append("locate(", 7);
  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()
{
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  DBUG_ASSERT(fixed == 1);
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  if (cmp_type == STRING_RESULT)
  {
    String *field;
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    if (!(field=args[0]->val_str(&value)))
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      return 0;					// -1 if null ?
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    for (uint i=1 ; i < arg_count ; i++)
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    {
      String *tmp_value=args[i]->val_str(&tmp);
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      if (tmp_value && !sortcmp(field,tmp_value,cmp_collation.collation))
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        return (longlong) (i);
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    }
  }
  else if (cmp_type == INT_RESULT)
  {
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    longlong val= args[0]->val_int();
    for (uint i=1; i < arg_count ; i++)
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    {
      if (val == args[i]->val_int())
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 	return (longlong) (i);
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    }
  }
  else
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  {
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    double val= args[0]->val_real();
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    for (uint i=1; i < arg_count ; i++)
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    {
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      if (val == args[i]->val_real())
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 	return (longlong) (i);
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    }
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  }
  return 0;
}

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void Item_func_field::fix_length_and_dec()
{
  maybe_null=0; max_length=3;
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  cmp_type= args[0]->result_type();
  for (uint i=1; i < arg_count ; i++)
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    cmp_type= item_cmp_type(cmp_type, args[i]->result_type());
  if (cmp_type == STRING_RESULT)
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    agg_arg_charsets(cmp_collation, args, arg_count, MY_COLL_CMP_CONV);
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}
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longlong Item_func_ascii::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;
  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_collations_for_comparison(cmp_collation, args, 2);
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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 && 
               wc == (my_wc_t) separator)
        return (longlong) ++position;
      else
        return (longlong) 0;
    }
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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();
  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()
{
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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)
      {
        void (*deinit)(UDF_INIT *) = (void (*)(UDF_INIT*))
        u_d->func_deinit;
        (*deinit)(&initid);
      }
      free_udf(u_d);
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    }
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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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#ifndef EMBEDDED_LIBRARY			// Avoid compiler warning
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  char buff[STACK_BUFF_ALLOC];			// Max argument in function
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#endif
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  DBUG_ENTER("Item_udf_func::fix_fields");

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  if (check_stack_overrun(thd, 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)->fix_fields(thd, tables, 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
	the particular user definted function.
      */
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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 folowing 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 !
      {
	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:
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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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    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)))
    {
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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:
      {
	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 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)
{
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  uchar is_null_tmp=0;
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  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;
    }
  }
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  char *res=func(&initid, &f_args, (char*) str->ptr(), &res_length,
		 &is_null_tmp, &error);
  if (is_null_tmp || !res || error)		// The !res is for safety
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  {
    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;
}



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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_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)
{
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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;
}

/* 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;
}

#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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  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);
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    tmp.append("\")", 2);
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    Query_log_event qev(current_thd, tmp.ptr(), tmp.length(),1, FALSE);
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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()
{
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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;
  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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  */
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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 (!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()
{
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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;
2240
  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;
  }

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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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  while (!thd->killed &&
	 (error=pthread_cond_timedwait(&ull->cond,&LOCK_user_locks,&abstime))
2288
	 != 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;
}


/*
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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);
2332
  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;
}


2363
longlong Item_func_last_insert_id::val_int()
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{
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  DBUG_ASSERT(fixed == 1);
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  if (arg_count)
  {
    longlong value=args[0]->val_int();
    current_thd->insert_id(value);
    null_value=args[0]->null_value;
    return value;
  }
  else
  {
    Item *it= get_system_var(current_thd, OPT_SESSION, "last_insert_id", 14,
			     "last_insert_id()");
    return it->val_int();
  }
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}

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

longlong Item_func_benchmark::val_int()
{
2385
  DBUG_ASSERT(fixed == 1);
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  char buff[MAX_FIELD_WIDTH];
2387
  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:
2394
      (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;
2402
    case ROW_RESULT:
2403
    default:
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      // This case should never be choosen
      DBUG_ASSERT(0);
      return 0;
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    }
  }
  return 0;
}

2412

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void Item_func_benchmark::print(String *str)
{
  str->append("benchmark(", 10);
  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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#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;
2447
    entry->update_query_id=0;
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    entry->collation.set(NULL, DERIVATION_NONE);
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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).
    */
2459
    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;
}

2471
/*
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  When a user variable is updated (in a SET command or a query like
  SELECT @a:= ).
2474
*/
2475

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bool Item_func_set_user_var::fix_fields(THD *thd, TABLE_LIST *tables,
					Item **ref)
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{
2479
  DBUG_ASSERT(fixed == 0);
2480
  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
2481
  if (Item_func::fix_fields(thd, tables, ref) ||
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      !(entry= get_variable(&thd->user_vars, name, 1)))
2483
    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).
  */
2489
  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.
  */
  if (!entry->collation.collation || !args[0]->null_value)
    entry->collation.set(args[0]->collation);
  collation.set(entry->collation);
2508
  cached_result_type= args[0]->result_type();
2509
  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;
2519
  collation.set(args[0]->collation);
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}

2522

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bool Item_func_set_user_var::update_hash(void *ptr, uint length,
2524
					 Item_result type,
2525
					 CHARSET_INFO *cs,
2526
					 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;
  }
  else
  {
2538 2539
    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))))
	  goto err;
      }
    }
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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);
    entry->length= length;
    entry->type=type;
2572
    entry->collation.set(cs, dv);
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  }
2574
  return 0;
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 err:
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  current_thd->fatal_error();			// Probably end of memory
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  null_value= 1;
  return 1;
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}


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

double user_var_entry::val(my_bool *null_value)
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{
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  if ((*null_value= (value == 0)))
    return 0.0;

  switch (type) {
  case REAL_RESULT:
    return *(double*) value;
  case INT_RESULT:
    return (double) *(longlong*) value;
  case STRING_RESULT:
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    return my_atof(value);                      // This is null terminated
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
2601
  return 0.0;					// Impossible
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}


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/* Get the value of a variable as an integer */

longlong user_var_entry::val_int(my_bool *null_value)
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{
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  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 STRING_RESULT:
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  {
    int error;
    return my_strtoll10(value, (char**) 0, &error);// String is null terminated
  }
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
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  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);
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    break;
  case INT_RESULT:
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    str->set(*(longlong*) value, &my_charset_bin);
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    break;
  case STRING_RESULT:
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    if (str->copy(value, length, collation.collation))
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      str= 0;					// EOM error
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  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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  }
2652
  return(str);
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}

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/*
  This functions is invoked on SET @variable or @variable:= expression.
  Evaluete (and check expression), store results.

  SYNOPSYS
    Item_func_set_user_var::check()

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

  RETURN
2667
    FALSE OK.
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*/

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

  switch (cached_result_type) {
  case REAL_RESULT:
  {
2678
    save_result.vreal= args[0]->val_real();
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    break;
  }
  case INT_RESULT:
  {
    save_result.vint= args[0]->val_int();
    break;
  }
  case STRING_RESULT:
  {
    save_result.vstr= args[0]->val_str(&value);
    break;
  }
  case ROW_RESULT:
  default:
    // This case should never be choosen
    DBUG_ASSERT(0);
    break;
  }
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  DBUG_RETURN(FALSE);
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}

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/*
  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
    0	Ok
    1	EOM Error

*/

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bool
Item_func_set_user_var::update()
{
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  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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  {
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    res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
		     REAL_RESULT, &my_charset_bin, DERIVATION_NONE);
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    break;
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  }
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  case INT_RESULT:
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  {
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    res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
		     INT_RESULT, &my_charset_bin, DERIVATION_NONE);
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    break;
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  }
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  case STRING_RESULT:
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  {
2739
    if (!save_result.vstr)					// Null value
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      res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
		       DERIVATION_NONE);
2742
    else
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      res= update_hash((void*) save_result.vstr->ptr(),
		       save_result.vstr->length(), STRING_RESULT,
		       save_result.vstr->charset(),
		       args[0]->collation.derivation);
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    break;
  }
2749
  case ROW_RESULT:
2750
  default:
2751 2752 2753 2754
    // This case should never be choosen
    DBUG_ASSERT(0);
    break;
  }
2755
  DBUG_RETURN(res);
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2756 2757 2758
}


2759
double Item_func_set_user_var::val_real()
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2760
{
2761
  DBUG_ASSERT(fixed == 1);
2762
  check();
2763 2764
  update();					// Store expression
  return entry->val(&null_value);
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2765 2766
}

2767
longlong Item_func_set_user_var::val_int()
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2768
{
2769
  DBUG_ASSERT(fixed == 1);
2770
  check();
2771 2772
  update();					// Store expression
  return entry->val_int(&null_value);
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2773 2774
}

2775
String *Item_func_set_user_var::val_str(String *str)
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2776
{
2777
  DBUG_ASSERT(fixed == 1);
2778
  check();
2779 2780
  update();					// Store expression
  return entry->val_str(&null_value, str, decimals);
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2781 2782 2783
}


2784 2785
void Item_func_set_user_var::print(String *str)
{
2786 2787 2788
  str->append("(@", 2);
  str->append(name.str, name.length);
  str->append(":=", 2);
2789 2790 2791 2792 2793
  args[0]->print(str);
  str->append(')');
}


2794 2795 2796 2797 2798 2799 2800 2801 2802 2803
void Item_func_set_user_var::print_as_stmt(String *str)
{
  str->append("set @", 5);
  str->append(name.str, name.length);
  str->append(":=", 2);
  args[0]->print(str);
  str->append(')');
}


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2804 2805 2806
String *
Item_func_get_user_var::val_str(String *str)
{
2807
  DBUG_ASSERT(fixed == 1);
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vva@eagle.mysql.r18.ru committed
2808
  DBUG_ENTER("Item_func_get_user_var::val_str");
2809
  if (!var_entry)
2810
    DBUG_RETURN((String*) 0);			// No such variable
2811
  DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
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2812 2813 2814
}


2815
double Item_func_get_user_var::val_real()
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2816
{
2817
  DBUG_ASSERT(fixed == 1);
2818 2819 2820
  if (!var_entry)
    return 0.0;					// No such variable
  return (var_entry->val(&null_value));
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2821 2822 2823 2824 2825
}


longlong Item_func_get_user_var::val_int()
{
2826
  DBUG_ASSERT(fixed == 1);
2827 2828 2829
  if (!var_entry)
    return LL(0);				// No such variable
  return (var_entry->val_int(&null_value));
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2830 2831 2832
}


2833
/*
2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
  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.

2844 2845 2846 2847
  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).
2848 2849 2850 2851 2852
  
  RETURN
    0  OK 
    1  Failed to put appropiate record into binary log
    
2853 2854
*/

2855 2856
int get_var_with_binlog(THD *thd, LEX_STRING &name, 
                        user_var_entry **out_entry)
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2857
{
2858
  BINLOG_USER_VAR_EVENT *user_var_event;
2859 2860
  user_var_entry *var_entry;
  var_entry= get_variable(&thd->user_vars, name, 0);
2861
  
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2862
  if (!(opt_bin_log && is_update_query(thd->lex->sql_command)))
2863 2864 2865 2866
  {
    *out_entry= var_entry;
    return 0;
  }
2867 2868

  if (!var_entry)
2869
  {
2870
    /*
2871 2872 2873 2874
      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).
2875 2876 2877 2878 2879
      We create it like if it had been explicitely set with SET before.
      The 'new' mimicks what sql_yacc.yy does when 'SET @a=10;'.
      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();
2880 2881
      this would save memory and time; but calling sql_set_variables() makes
      one unique place to maintain (sql_set_variables()). 
2882 2883 2884 2885 2886
    */

    List<set_var_base> tmp_var_list;
    tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                       new Item_null())));
2887 2888
    /* Create the variable */
    if (sql_set_variables(thd, &tmp_var_list))
2889 2890 2891 2892 2893
      goto err;
    if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
      goto err;
  }
  else if (var_entry->used_query_id == thd->query_id)
2894 2895 2896 2897 2898 2899 2900 2901 2902
  {
    /* 
       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;
  }
2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925

  uint size;
  /*
    First we need to store value of var_entry, when the next situation
    appers:
    > set @a:=1;
    > insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
    We have to write to binlog value @a= 1;
  */
  size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;      
  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;
  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;
2926
  }
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936
  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;
2937 2938 2939
  
  *out_entry= var_entry;
  return 0;
2940

2941
err:
2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
  *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;
2954

2955
  error= get_var_with_binlog(thd, name, &var_entry);
2956 2957

  if (var_entry)
2958
  {
2959
    collation.set(var_entry->collation);
2960 2961 2962 2963 2964 2965 2966 2967 2968
    switch (var_entry->type) {
    case REAL_RESULT:
      max_length= DBL_DIG + 8;
    case INT_RESULT:
      max_length= MAX_BIGINT_WIDTH;
      break;
    case STRING_RESULT:
      max_length= MAX_BLOB_WIDTH;
      break;
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2969 2970
    case ROW_RESULT:                            // Keep compiler happy
      break;
2971 2972
    }
  }
2973 2974 2975
  else
    null_value= 1;

2976 2977
  if (error)
    thd->fatal_error();
2978

2979
  return;
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2980 2981 2982
}


2983
bool Item_func_get_user_var::const_item() const
2984
{
2985
  return (!var_entry || current_thd->query_id != var_entry->update_query_id);
2986
}
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2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998


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;
}

2999 3000 3001

void Item_func_get_user_var::print(String *str)
{
3002
  str->append("(@", 2);
3003 3004 3005 3006
  str->append(name.str,name.length);
  str->append(')');
}

3007

3008
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022
{
  /* 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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3023 3024
longlong Item_func_inet_aton::val_int()
{
3025
  DBUG_ASSERT(fixed == 1);
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3026 3027 3028 3029 3030
  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];
3031
  int dot_count= 0;
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3032

3033
  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
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3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049
  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 == '.')
    {
3050
      dot_count++;
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3051 3052 3053 3054 3055 3056 3057
      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
3058
  {
3059 3060 3061 3062 3063 3064
    /*
      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
    */
3065
    switch (dot_count) {
3066 3067
    case 1: result<<= 8; /* Fall through */
    case 2: result<<= 8; /* Fall through */
3068
    }
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3069
    return (result << 8) + (ulonglong) byte_result;
3070
  }
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3071 3072 3073 3074 3075 3076

err:
  null_value=1;
  return 0;
}

3077

3078
void Item_func_match::init_search(bool no_order)
3079
{
3080
  DBUG_ENTER("Item_func_match::init_search");
3081 3082

  /* Check if init_search() has been called before */
3083
  if (ft_handler)
3084
    DBUG_VOID_RETURN;
3085

3086
  if (key == NO_SUCH_KEY)
3087 3088
  {
    List<Item> fields;
3089
    fields.push_back(new Item_string(" ",1, cmp_collation.collation));
3090 3091
    for (uint i=1; i < arg_count; i++)
      fields.push_back(args[i]);
3092
    concat=new Item_func_concat_ws(fields);
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3093 3094 3095
    /*
      Above function used only to get value and do not need fix_fields for it:
      Item_string - basic constant
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3096 3097
      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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3098 3099
    */
    concat->quick_fix_field();
3100
  }
3101

3102 3103
  if (master)
  {
3104 3105
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
3106 3107
    ft_handler=master->ft_handler;
    join_key=master->join_key;
3108
    DBUG_VOID_RETURN;
3109 3110
  }

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3111
  String *ft_tmp= 0;
3112

3113
  // MATCH ... AGAINST (NULL) is meaningless, but possible
3114
  if (!(ft_tmp=key_item()->val_str(&value)))
3115
  {
3116 3117
    ft_tmp= &value;
    value.set("",0,cmp_collation.collation);
3118 3119
  }

3120 3121
  if (ft_tmp->charset() != cmp_collation.collation)
  {
3122
    uint dummy_errors;
3123
    search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
3124
                      cmp_collation.collation, &dummy_errors);
3125
    ft_tmp= &search_value;
3126 3127
  }

3128 3129
  if (join_key && !no_order)
    flags|=FT_SORTED;
3130
  ft_handler=table->file->ft_init_ext(flags, key,
3131
				      (byte*) ft_tmp->ptr(),
3132
				      ft_tmp->length());
3133 3134 3135

  if (join_key)
    table->file->ft_handler=ft_handler;
3136 3137

  DBUG_VOID_RETURN;
3138 3139
}

3140

3141
bool Item_func_match::fix_fields(THD *thd, TABLE_LIST *tlist, Item **ref)
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3142
{
3143
  DBUG_ASSERT(fixed == 0);
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3144
  Item *item;
3145
  LINT_INIT(item);				// Safe as arg_count is > 1
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3146

3147 3148 3149
  maybe_null=1;
  join_key=0;

3150 3151 3152 3153 3154
  /*
    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.
3155
   */
3156 3157
  if (Item_func::fix_fields(thd, tlist, ref) ||
      !args[0]->const_during_execution())
3158 3159
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
3160
    return TRUE;
3161
  }
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3162

3163 3164
  const_item_cache=0;
  for (uint i=1 ; i < arg_count ; i++)
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3165
  {
3166
    item=args[i];
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3167
    if (item->type() == Item::REF_ITEM)
3168 3169
      args[i]= item= *((Item_ref *)item)->ref;
    if (item->type() != Item::FIELD_ITEM)
3170
      key=NO_SUCH_KEY;
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3171
  }
3172 3173 3174 3175 3176 3177
  /*
    Check that all columns come from the same table.
    We've already checked that columns in MATCH are fields so 
    PARAM_TABLE_BIT can only appear from AGAINST argument.
  */
  if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
3178
    key=NO_SUCH_KEY;
3179
  
3180
  if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
3181 3182
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
3183
    return TRUE;
3184
  }
3185 3186 3187
  table=((Item_field *)item)->field->table;
  table->fulltext_searched=1;
  return agg_arg_collations_for_comparison(cmp_collation, args+1, arg_count-1);
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3188
}
3189

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3190 3191 3192
bool Item_func_match::fix_index()
{
  Item_field *item;
3193
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
3194
  uint max_cnt=0, mkeys=0, i;
3195

3196
  if (key == NO_SUCH_KEY)
3197
    return 0;
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3198

3199
  for (keynr=0 ; keynr < table->keys ; keynr++)
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3200
  {
3201
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
3202
        (table->keys_in_use_for_query.is_set(keynr)))
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3203
    {
3204
      ft_to_key[fts]=keynr;
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3205 3206 3207 3208 3209 3210
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
3211
    goto err;
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3212

3213
  for (i=1; i < arg_count; i++)
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3214
  {
3215
    item=(Item_field*)args[i];
3216
    for (keynr=0 ; keynr < fts ; keynr++)
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3217
    {
3218
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
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3219 3220 3221 3222 3223
      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))
3224
	  ft_cnt[keynr]++;
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3225 3226 3227 3228
      }
    }
  }

3229
  for (keynr=0 ; keynr < fts ; keynr++)
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3230
  {
3231
    if (ft_cnt[keynr] > max_cnt)
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3232
    {
3233
      mkeys=0;
3234 3235
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
3236 3237
      continue;
    }
3238
    if (max_cnt && ft_cnt[keynr] == max_cnt)
3239 3240
    {
      mkeys++;
3241 3242
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
3243
      continue;
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3244 3245 3246
    }
  }

3247
  for (keynr=0 ; keynr <= mkeys ; keynr++)
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3248
  {
3249 3250
    // partial keys doesn't work
    if (max_cnt < arg_count-1 ||
3251
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
3252
      continue;
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3253

3254
    key=ft_to_key[keynr];
3255

3256 3257 3258
    return 0;
  }

3259
err:
3260
  if (flags & FT_BOOL)
3261
  {
3262
    key=NO_SUCH_KEY;
3263 3264
    return 0;
  }
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3265 3266
  my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
             ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
3267
  return 1;
3268 3269
}

3270

3271
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
3272
{
3273 3274
  if (item->type() != FUNC_ITEM || ((Item_func*)item)->functype() != FT_FUNC ||
      flags != ((Item_func_match*)item)->flags)
3275 3276 3277 3278 3279
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
3280
      key_item()->eq(ifm->key_item(), binary_cmp))
3281
    return 1;
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3282 3283 3284 3285

  return 0;
}

3286

3287
double Item_func_match::val_real()
3288
{
3289
  DBUG_ASSERT(fixed == 1);
3290
  DBUG_ENTER("Item_func_match::val");
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3291
  if (ft_handler == NULL)
3292
    DBUG_RETURN(-1.0);
3293

3294 3295 3296
  if (table->null_row) /* NULL row from an outer join */
    return 0.0;

3297 3298 3299
  if (join_key)
  {
    if (table->file->ft_handler)
3300
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
3301 3302 3303
    join_key=0;
  }

3304
  if (key == NO_SUCH_KEY)
3305
  {
3306 3307
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
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      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
3311 3312
  }
  else
3313 3314
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
                                                   table->record[0], 0));
3315 3316
}

3317 3318
void Item_func_match::print(String *str)
{
3319
  str->append("(match ", 7);
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3320
  print_args(str, 1);
3321
  str->append(" against (", 10);
3322
  args[0]->print(str);
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3323
  if (flags & FT_BOOL)
3324
    str->append(" in boolean mode", 16);
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3325 3326
  else if (flags & FT_EXPAND)
    str->append(" with query expansion", 21);
3327
  str->append("))", 2);
3328
}
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3329

3330 3331
longlong Item_func_bit_xor::val_int()
{
3332
  DBUG_ASSERT(fixed == 1);
3333 3334
  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
3335
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
3336 3337 3338 3339
    return 0;
  return (longlong) (arg1 ^ arg2);
}

3340

3341 3342 3343 3344
/***************************************************************************
  System variables
****************************************************************************/

3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365
/*
  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)
3366
{
3367 3368
  if (component.str == 0 &&
      !my_strcasecmp(system_charset_info, name.str, "VERSION"))
3369 3370 3371
    return new Item_string("@@VERSION", server_version,
			   (uint) strlen(server_version),
			   system_charset_info);
3372 3373 3374

  Item *item;
  sys_var *var;
3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387
  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
  }
3388

3389
  if (!(var= find_sys_var(base_name->str, base_name->length)))
3390
    return 0;
3391 3392 3393 3394
  if (component.str)
  {
    if (!var->is_struct())
    {
3395
      my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
3396 3397 3398 3399
      return 0;
    }
  }
  if (!(item=var->item(thd, var_type, component_name)))
3400
    return 0;					// Impossible
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3401
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
3402 3403
  buff[0]='@';
  buff[1]='@';
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3404 3405 3406 3407 3408
  pos=buff+2;
  if (var_type == OPT_SESSION)
    pos=strmov(pos,"session.");
  else if (var_type == OPT_GLOBAL)
    pos=strmov(pos,"global.");
3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
  
  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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3422
  // set_name() will allocate the name
3423
  item->set_name(buff,(uint) (pos-buff), system_charset_info);
3424
  return item;
3425
}
3426

3427

3428 3429
Item *get_system_var(THD *thd, enum_var_type var_type, const char *var_name,
		     uint length, const char *item_name)
3430 3431 3432
{
  Item *item;
  sys_var *var;
3433 3434 3435
  LEX_STRING null_lex_string;

  null_lex_string.str= 0;
3436 3437 3438

  var= find_sys_var(var_name, length);
  DBUG_ASSERT(var != 0);
3439
  if (!(item=var->item(thd, var_type, &null_lex_string)))
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3440
    return 0;						// Impossible
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3441
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
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3442
  item->set_name(item_name, 0, system_charset_info);	// Will use original name
3443 3444 3445 3446
  return item;
}


3447 3448
/*
  Check a user level lock.
3449 3450 3451 3452 3453 3454 3455 3456

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
3457 3458
*/

3459
longlong Item_func_is_free_lock::val_int()
3460
{
3461
  DBUG_ASSERT(fixed == 1);
3462
  String *res=args[0]->val_str(&value);
3463
  User_level_lock *ull;
3464 3465

  null_value=0;
3466
  if (!res || !res->length())
3467 3468 3469 3470 3471 3472
  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
3473
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
3474 3475 3476 3477 3478 3479
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
3480

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3481 3482
longlong Item_func_is_used_lock::val_int()
{
3483
  DBUG_ASSERT(fixed == 1);
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3484
  String *res=args[0]->val_str(&value);
3485
  User_level_lock *ull;
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3486 3487 3488 3489 3490 3491

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
3492
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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3493 3494 3495 3496 3497 3498 3499 3500 3501
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}

3502

3503 3504 3505 3506 3507 3508 3509 3510 3511
longlong Item_func_row_count::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->row_count_func;
}


3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526
Item_func_sp::Item_func_sp(sp_name *name)
  :Item_func(), m_name(name), m_sp(NULL)
{
  m_name->init_qname(current_thd);
}

Item_func_sp::Item_func_sp(sp_name *name, List<Item> &list)
  :Item_func(list), m_name(name), m_sp(NULL)
{
  m_name->init_qname(current_thd);
}

const char *
Item_func_sp::func_name() const
{
3527
  THD *thd= current_thd;
3528
  /* Calculate length to avoud reallocation of string for sure */
3529 3530 3531 3532
  uint len= ((m_name->m_db.length +
              m_name->m_name.length)*2 + //characters*quoting
             2 +                         // ` and `
             1 +                         // .
3533 3534
             1 +                         // end of string
             ALIGN_SIZE(1));             // to avoid String reallocation
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3535
  String qname((char *)alloc_root(thd->mem_root, len), len,
3536
               system_charset_info);
3537

3538 3539 3540 3541 3542
  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();
3543 3544
}

3545

3546 3547 3548 3549 3550
int
Item_func_sp::execute(Item **itp)
{
  DBUG_ENTER("Item_func_sp::execute");
  THD *thd= current_thd;
3551
  int res;
3552 3553 3554
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  st_sp_security_context save_ctx;
#endif
3555

3556
  if (! m_sp)
3557
    m_sp= sp_find_function(thd, m_name);
3558
  if (! m_sp)
3559
  {
3560
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
3561
    DBUG_RETURN(-1);
3562
  }
3563

3564
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3565
  sp_change_security_context(thd, m_sp, &save_ctx);
3566
#endif
3567

3568 3569 3570 3571 3572
  /*
    We don't need to surpress senfing of ok packet here (by setting
    thd->net.no_send_ok to true), because we are not allowing statements
    in functions now.
  */
3573 3574
  res= m_sp->execute_function(thd, args, arg_count, itp);

3575
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3576
  sp_restore_security_context(thd, m_sp, &save_ctx);
3577
#endif
3578 3579

  DBUG_RETURN(res);
3580 3581
}

3582

3583 3584
enum enum_field_types
Item_func_sp::field_type() const
3585
{
3586
  DBUG_ENTER("Item_func_sp::field_type");
3587

3588
  if (! m_sp)
3589
    m_sp= sp_find_function(current_thd, m_name);
3590 3591
  if (m_sp)
  {
3592 3593
    DBUG_PRINT("info", ("m_returns = %d", m_sp->m_returns));
    DBUG_RETURN(m_sp->m_returns);
3594
  }
3595
  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
3596
  DBUG_RETURN(MYSQL_TYPE_VARCHAR);
3597 3598
}

3599

3600 3601
Item_result
Item_func_sp::result_type() const
3602
{
3603 3604
  DBUG_ENTER("Item_func_sp::result_type");
  DBUG_PRINT("info", ("m_sp = %p", m_sp));
3605

3606
  if (! m_sp)
3607
    m_sp= sp_find_function(current_thd, m_name);
3608
  if (m_sp)
3609
  {
3610
    DBUG_RETURN(m_sp->result());
3611
  }
3612
  my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
3613
  DBUG_RETURN(STRING_RESULT);
3614 3615 3616 3617 3618 3619 3620
}

void
Item_func_sp::fix_length_and_dec()
{
  DBUG_ENTER("Item_func_sp::fix_length_and_dec");

3621
  if (! m_sp)
3622
    m_sp= sp_find_function(current_thd, m_name);
3623 3624
  if (! m_sp)
  {
3625
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
3626 3627
  }
  else
3628 3629 3630 3631
  {
    switch (m_sp->result()) {
    case STRING_RESULT:
      maybe_null= 1;
3632
      max_length= MAX_BLOB_WIDTH;
3633 3634 3635 3636 3637 3638 3639 3640 3641
      break;
    case REAL_RESULT:
      decimals= NOT_FIXED_DEC;
      max_length= float_length(decimals);
      break;
    case INT_RESULT:
      decimals= 0;
      max_length= 21;
      break;
3642 3643 3644 3645 3646
    case ROW_RESULT:
    default:
      // This case should never be choosen
      DBUG_ASSERT(0);
      break;
3647 3648 3649 3650
    }
  }
  DBUG_VOID_RETURN;
}
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3651 3652


3653 3654 3655 3656 3657 3658 3659
longlong Item_func_found_rows::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->found_rows();
}