item_func.cc 125 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* This file defines all numerical functions */

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

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

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


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


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/* return TRUE if item is a constant */

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

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

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

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

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/*
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  Resolve references to table column for a function and its argument
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  SYNOPSIS:
  fix_fields()
  thd		Thread object
  ref		Pointer to where this object is used.  This reference
		is used if we want to replace this object with another
		one (for example in the summary functions).

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

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

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

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

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

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

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

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/*
  Transform an Item_func object with a transformer callback function
   
  SYNOPSIS
    transform()
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      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
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  DESCRIPTION
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    The function recursively applies the transform method to each
    argument of the Item_func node.
    If the call of the method for an argument item returns a new item
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    the old item is substituted for a new one.
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    After this the transformer is applied to the root node
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    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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{
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  DBUG_ASSERT(!current_thd->is_stmt_prepare());

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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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      /*
        THD::change_item_tree() should be called only if the tree was
        really transformed, i.e. when a new item has been created.
        Otherwise we'll be allocating a lot of unnecessary memory for
        change records at each execution.
      */
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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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/*
  Compile Item_func object with a processor and a transformer callback functions
   
  SYNOPSIS
    compile()
      analyzer      the analyzer callback function to be applied to the nodes
                    of the tree of the object
      arg_p         in/out parameter to be passed to the processor
      transformer   the transformer callback function to be applied to the nodes
                    of the tree of the object
      arg_t         parameter to be passed to the transformer
  
  DESCRIPTION
    First the function applies the analyzer to the root node of
    the Item_func object. Then if the analizer succeeeds (returns TRUE)
    the function recursively applies the compile method to each argument
    of the Item_func node.
    If the call of the method for an argument item returns a new item
    the old item is substituted for a new one.
    After this the transformer 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::compile(Item_analyzer analyzer, byte **arg_p,
                         Item_transformer transformer, byte *arg_t)
{
  if (!(this->*analyzer)(arg_p))
    return 0;
  if (arg_count)
  {
    Item **arg,**arg_end;
    for (arg= args, arg_end= args+arg_count; arg != arg_end; arg++)
    {
      /* 
        The same parameter value of arg_p must be passed
        to analyze any argument of the condition formula.
      */   
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      byte *arg_v= *arg_p;
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      Item *new_item= (*arg)->compile(analyzer, &arg_v, transformer, arg_t);
      if (new_item && *arg != new_item)
        current_thd->change_item_tree(arg, new_item);
    }
  }
  return (this->*transformer)(arg_t);
}

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

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


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


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

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


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


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


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

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

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Field *Item_func::tmp_table_field(TABLE *table)
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{
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  Field *field;
  LINT_INIT(field);
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  switch (result_type()) {
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  case INT_RESULT:
    if (max_length > 11)
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      field= new Field_longlong(max_length, maybe_null, name, unsigned_flag);
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    else
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      field= new Field_long(max_length, maybe_null, name, unsigned_flag);
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    break;
  case REAL_RESULT:
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    field= new Field_double(max_length, maybe_null, name, decimals);
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    break;
  case STRING_RESULT:
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    return make_string_field(table);
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    break;
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  case DECIMAL_RESULT:
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    field= new Field_new_decimal(my_decimal_precision_to_length(decimal_precision(),
                                                                decimals,
                                                                unsigned_flag),
                                 maybe_null, name, decimals, unsigned_flag);
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    break;
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  case ROW_RESULT:
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  default:
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    // This case should never be chosen
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    DBUG_ASSERT(0);
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    field= 0;
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    break;
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  }
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  if (field)
    field->init(table);
  return field;
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}

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bool Item_func::is_expensive_processor(byte *arg)
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{
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  return is_expensive();
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}


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

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


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


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


void Item_func_numhybrid::fix_num_length_and_dec()
{}


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

  SYNOPSIS
    Item_func::count_decimal_length()
*/

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


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

  SYNOPSIS
    Item_func::count_only_length()
*/

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

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

  SYNOPSIS
    Item_func::count_real_length()
*/

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



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


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Item *Item_func::get_tmp_table_item(THD *thd)
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{
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  if (!with_sum_func && !const_item() && functype() != SUSERVAR_FUNC)
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    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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  str->set_int(nr, unsigned_flag, &my_charset_bin);
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  return str;
}

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


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

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

  return FALSE;
}


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

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

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

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


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


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


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


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

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


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

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


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


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

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

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


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

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

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


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


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

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

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


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


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


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


my_decimal *Item_decimal_typecast::val_decimal(my_decimal *dec)
{
  my_decimal tmp_buf, *tmp= args[0]->val_decimal(&tmp_buf);
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  bool sign;
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  if ((null_value= args[0]->null_value))
    return NULL;
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  my_decimal_round(E_DEC_FATAL_ERROR, tmp, decimals, FALSE, dec);
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  sign= dec->sign();
  if (unsigned_flag)
  {
    if (sign)
    {
      my_decimal_set_zero(dec);
      goto err;
    }
  }
  if (max_length - 2 - decimals < (uint) my_decimal_intg(dec))
  {
    max_my_decimal(dec, max_length - 2, decimals);
    dec->sign(sign);
    goto err;
  }
  return dec;

err:
  push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
                      ER_WARN_DATA_OUT_OF_RANGE,
                      ER(ER_WARN_DATA_OUT_OF_RANGE),
                      name, 1);
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  return dec;
}


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


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

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


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/*
  Calculate plus of two decimail's

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

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

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

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

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

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

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

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


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

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

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/* See Item_func_plus::decimal_op for comments */

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

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

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

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


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/* See Item_func_plus::decimal_op for comments */

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


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


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

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


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

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

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


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


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

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

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

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

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


void Item_func_mod::fix_length_and_dec()
{
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  Item_num_op::fix_length_and_dec();
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  maybe_null= 1;
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}


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

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

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

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

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

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

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

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


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

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

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

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

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

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

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

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

// Trigonometric functions

1612
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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  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_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;
}

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


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

  DBUG_VOID_RETURN;
}


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

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


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


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

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


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


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

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

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


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double Item_func_round::real_op()
{
  double value= args[0]->val_real();
  int dec= (int) args[1]->val_int();

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

  return 0.0;
}


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

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


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


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bool Item_func_rand::fix_fields(THD *thd,Item **ref)
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{
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  if (Item_real_func::fix_fields(thd, ref))
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    return TRUE;
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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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    if (!args[0]->const_during_execution())
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "RAND");
      return TRUE;
    }
2038
    /*
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      Allocate rand structure once: we must use thd->stmt_arena
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      to create rand in proper mem_root if it's a prepared statement or
      stored procedure.
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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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    */
    if (!rand && !(rand= (struct rand_struct*)
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                   thd->stmt_arena->alloc(sizeof(*rand))))
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      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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    /*
      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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    if (!thd->rand_used)
    {
      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()
2090
{
2091
  DBUG_ASSERT(fixed == 1);
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  return my_rnd(rand);
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}

longlong Item_func_sign::val_int()
{
2097
  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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{
2106
  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()
{
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  int max_int_part=0;
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  decimals=0;
  max_length=0;
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  maybe_null=0;
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  cmp_type=args[0]->result_type();
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  for (uint i=0 ; i < arg_count ; i++)
  {
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    set_if_bigger(max_length, args[i]->max_length);
    set_if_bigger(decimals, args[i]->decimals);
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    set_if_bigger(max_int_part, args[i]->decimal_int_part());
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    if (args[i]->maybe_null)
      maybe_null=1;
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    cmp_type=item_cmp_type(cmp_type,args[i]->result_type());
  }
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  if (cmp_type == STRING_RESULT)
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    agg_arg_charsets(collation, args, arg_count, MY_COLL_CMP_CONV, 1);
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  else if ((cmp_type == DECIMAL_RESULT) || (cmp_type == INT_RESULT))
    max_length= my_decimal_precision_to_length(max_int_part+decimals, decimals,
                                            unsigned_flag);
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}


String *Item_func_min_max::val_str(String *str)
{
2141
  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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    str->set_int(nr, unsigned_flag, &my_charset_bin);
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    return str;
  }
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  case DECIMAL_RESULT:
  {
    my_decimal dec_buf, *dec_val= val_decimal(&dec_buf);
    if (null_value)
      return 0;
    my_decimal2string(E_DEC_FATAL_ERROR, dec_val, 0, 0, 0, str);
    return str;
  }
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  case REAL_RESULT:
  {
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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_real(nr,decimals,&my_charset_bin);
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    return str;
  }
  case STRING_RESULT:
  {
    String *res;
    LINT_INIT(res);
    for (uint i=0; i < arg_count ; i++)
    {
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      if (i == 0)
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	res=args[i]->val_str(str);
      else
      {
	String *res2;
	res2= args[i]->val_str(res == str ? &tmp_value : str);
	if (res2)
	{
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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 ((null_value= args[i]->null_value))
2187
        return 0;
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    }
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    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 chosen
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    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;
  for (uint i=0; i < arg_count ; i++)
  {
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    if (i == 0)
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      value= args[i]->val_real();
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    else
    {
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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;
    }
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    if ((null_value= args[i]->null_value))
      break;
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  }
  return value;
}


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

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

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  for (uint i=0; i < arg_count ; i++)
  {
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    if (i == 0)
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      res= args[i]->val_decimal(dec);
    else
    {
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      tmp= args[i]->val_decimal(&tmp_buf);      // Zero if NULL
      if (tmp && (my_decimal_cmp(tmp, res) * cmp_sign) < 0)
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      {
        if (tmp == &tmp_buf)
        {
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          /* Move value out of tmp_buf as this will be reused on next loop */
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          my_decimal2decimal(tmp, dec);
          res= dec;
        }
        else
          res= tmp;
      }
    }
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    if ((null_value= args[i]->null_value))
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    {
      res= 0;
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      break;
2273
    }
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  }
  return res;
}


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longlong Item_func_length::val_int()
{
2281
  DBUG_ASSERT(fixed == 1);
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  String *res=args[0]->val_str(&value);
  if (!res)
  {
    null_value=1;
    return 0; /* purecov: inspected */
  }
  null_value=0;
  return (longlong) res->length();
}

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longlong Item_func_char_length::val_int()
{
2295
  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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}

2306

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longlong Item_func_coercibility::val_int()
{
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  DBUG_ASSERT(fixed == 1);
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  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;
2318
  agg_arg_charsets(cmp_collation, args, 2, MY_COLL_CMP_CONV, 1);
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}

2321

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longlong Item_func_locate::val_int()
{
2324
  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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  /* must be longlong to avoid truncation */
  longlong start=  0; 
  longlong start0= 0;
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  my_match_t match;
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  if (arg_count == 3)
  {
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    start0= start= args[2]->val_int() - 1;

    if ((start < 0) || (start > a->length()))
      return 0;

    /* start is now sufficiently valid to pass to charpos function */
    start= a->charpos(start);

    if (start + b->length() > a->length())
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      return 0;
  }
2351

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  if (!b->length())				// Found empty string at start
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    return start + 1;
2354
  
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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)
{
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  str->append(STRING_WITH_LEN("locate("));
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  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);
2382

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  if (cmp_type == STRING_RESULT)
  {
    String *field;
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    if (!(field= args[0]->val_str(&value)))
      return 0;
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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();
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    if (args[0]->null_value)
      return 0;
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    for (uint i=1; i < arg_count ; i++)
2401
    {
2402
      if (val == args[i]->val_int() && !args[i]->null_value)
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        return (longlong) (i);
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    }
  }
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  else if (cmp_type == DECIMAL_RESULT)
  {
    my_decimal dec_arg_buf, *dec_arg,
               dec_buf, *dec= args[0]->val_decimal(&dec_buf);
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    if (args[0]->null_value)
      return 0;
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    for (uint i=1; i < arg_count; i++)
    {
      dec_arg= args[i]->val_decimal(&dec_arg_buf);
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      if (!args[i]->null_value && !my_decimal_cmp(dec_arg, dec))
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        return (longlong) (i);
    }
  }
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  else
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  {
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    double val= args[0]->val_real();
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    if (args[0]->null_value)
      return 0;
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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() && !args[i]->null_value)
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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, 1);
2442
}
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longlong Item_func_ascii::val_int()
{
2447
  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
2470
  if (use_mb(res->charset()))
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  {
    register const char *str=res->ptr();
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    register uint32 n=0, l=my_ismbchar(res->charset(),str,str+res->length());
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    if (!l)
      return (longlong)((uchar) *str);
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    while (l--)
      n=(n<<8)|(uint32)((uchar) *str++);
    return (longlong) n;
  }
#endif
  return (longlong) ((uchar) (*res)[0]);
}

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

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

static const char separator=',';

longlong Item_func_find_in_set::val_int()
{
2515
  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);
2555 2556
        bool is_separator= (wc == (my_wc_t) separator);
        if (is_separator || is_last_item)
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        {
          position++;
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          if (is_last_item && !is_separator)
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            str_end= substr_end;
          if (!my_strnncoll(cs, (const uchar *) str_begin,
                            str_end - str_begin,
                            find_str, find_str_len))
            return (longlong) position;
          else
            str_begin= substr_end;
        }
        str_end= substr_end;
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      }
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      else if (str_end - str_begin == 0 &&
               find_str_len == 0 &&
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               wc == (my_wc_t) separator)
        return (longlong) ++position;
      else
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        return LL(0);
2576
    }
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  }
  return 0;
}

longlong Item_func_bit_count::val_int()
{
2583
  DBUG_ASSERT(fixed == 1);
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  ulonglong value= (ulonglong) args[0]->val_int();
2585
  if ((null_value= args[0]->null_value))
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    return 0; /* purecov: inspected */
2587
  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>
2594
** Rewritten by monty.
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****************************************************************************/

#ifdef HAVE_DLOPEN

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void udf_handler::cleanup()
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{
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  if (!not_original)
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  {
2603
    if (initialized)
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    {
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      if (u_d->func_deinit != NULL)
      {
2607
        Udf_func_deinit deinit= u_d->func_deinit;
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        (*deinit)(&initid);
      }
      free_udf(u_d);
2611
      initialized= FALSE;
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    }
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    if (buffers)				// Because of bug in ecc
      delete [] buffers;
2615
    buffers= 0;
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  }
}


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

2629
  if (check_stack_overrun(thd, STACK_MIN_SIZE, buff))
2630
    DBUG_RETURN(TRUE);				// Fatal error flag is set!
2631

2632
  udf_func *tmp_udf=find_udf(u_d->name.str,(uint) u_d->name.length,1);
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  if (!tmp_udf)
  {
2636
    my_error(ER_CANT_FIND_UDF, MYF(0), u_d->name.str, errno);
2637
    DBUG_RETURN(TRUE);
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  }
  u_d=tmp_udf;
  args=arguments;

  /* Fix all arguments */
2643
  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);
2654
      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++)
    {
2662
      if (!(*arg)->fixed &&
2663
          (*arg)->fix_fields(thd, arg))
2664
	DBUG_RETURN(1);
2665
      // we can't assign 'item' before, because fix_fields() can change arg
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      Item *item= *arg;
2667
      if (item->check_cols(1))
2668
	DBUG_RETURN(TRUE);
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      /*
	TODO: We should think about this. It is not always
	right way just to set an UDF result to return my_charset_bin
	if one argument has binary sorting order.
	The result collation should be calculated according to arguments
	derivations in some cases and should not in other cases.
	Moreover, some arguments can represent a numeric input
	which doesn't effect the result character set and collation.
	There is no a general rule for UDF. Everything depends on
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        the particular user defined function.
2679
      */
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      if (item->collation.collation->state & MY_CS_BINSORT)
	func->collation.set(&my_charset_bin);
2682
      if (item->maybe_null)
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	func->maybe_null=1;
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      func->with_sum_func= func->with_sum_func || item->with_sum_func;
      used_tables_cache|=item->used_tables();
      const_item_cache&=item->const_item();
      f_args.arg_type[i]=item->result_type();
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    }
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    //TODO: why all following memory is not allocated with 1 call of sql_alloc?
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    if (!(buffers=new String[arg_count]) ||
	!(f_args.args= (char**) sql_alloc(arg_count * sizeof(char *))) ||
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	!(f_args.lengths= (ulong*) sql_alloc(arg_count * sizeof(long))) ||
	!(f_args.maybe_null= (char*) sql_alloc(arg_count * sizeof(char))) ||
	!(num_buffer= (char*) sql_alloc(arg_count *
					ALIGN_SIZE(sizeof(double)))) ||
	!(f_args.attributes= (char**) sql_alloc(arg_count * sizeof(char *))) ||
	!(f_args.attribute_lengths= (ulong*) sql_alloc(arg_count *
						       sizeof(long))))
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    {
      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
  }
  func->fix_length_and_dec();
  initid.max_length=func->max_length;
  initid.maybe_null=func->maybe_null;
  initid.const_item=const_item_cache;
  initid.decimals=func->decimals;
  initid.ptr=0;

  if (u_d->func_init)
  {
    char *to=num_buffer;
    for (uint i=0; i < arg_count; i++)
    {
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      /*
       For a constant argument i, args->args[i] points to the argument value. 
       For non-constant, args->args[i] is NULL.
      */
      f_args.args[i]= NULL;         /* Non-const unless updated below. */

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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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      if (arguments[i]->const_item())
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      {
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        if (arguments[i]->null_value)
          continue;

        switch (arguments[i]->result_type()) 
        {
        case STRING_RESULT:
        case DECIMAL_RESULT:
        {
          String *res= arguments[i]->val_str(&buffers[i]);
          f_args.args[i]= (char*) res->ptr();
          break;
        }
        case INT_RESULT:
          *((longlong*) to)= arguments[i]->val_int();
          f_args.args[i]= to;
          to+= ALIGN_SIZE(sizeof(longlong));
          break;
        case REAL_RESULT:
          *((double*) to)= arguments[i]->val_real();
          f_args.args[i]= to;
          to+= ALIGN_SIZE(sizeof(double));
          break;
        case ROW_RESULT:
        default:
          // This case should never be chosen
          DBUG_ASSERT(0);
          break;
        }
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      }
    }
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    thd->net.last_error[0]=0;
2760
    Udf_func_init init= u_d->func_init;
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    if ((error=(uchar) init(&initid, &f_args, thd->net.last_error)))
    {
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      my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
               u_d->name.str, thd->net.last_error);
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      free_udf(u_d);
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      DBUG_RETURN(TRUE);
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    }
    func->max_length=min(initid.max_length,MAX_BLOB_WIDTH);
    func->maybe_null=initid.maybe_null;
    const_item_cache=initid.const_item;
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    func->decimals=min(initid.decimals,NOT_FIXED_DEC);
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  }
  initialized=1;
  if (error)
  {
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    my_error(ER_CANT_INITIALIZE_UDF, MYF(0),
             u_d->name.str, ER(ER_UNKNOWN_ERROR));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(FALSE);
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}


bool udf_handler::get_arguments()
{
  if (error)
    return 1;					// Got an error earlier
  char *to= num_buffer;
  uint str_count=0;
  for (uint i=0; i < f_args.arg_count; i++)
  {
    f_args.args[i]=0;
    switch (f_args.arg_type[i]) {
    case STRING_RESULT:
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    case DECIMAL_RESULT:
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      {
	String *res=args[i]->val_str(&buffers[str_count++]);
	if (!(args[i]->null_value))
	{
	  f_args.args[i]=    (char*) res->ptr();
	  f_args.lengths[i]= res->length();
	  break;
	}
      }
    case INT_RESULT:
      *((longlong*) to) = args[i]->val_int();
      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(longlong));
      }
      break;
    case REAL_RESULT:
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      *((double*) to)= args[i]->val_real();
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      if (!args[i]->null_value)
      {
	f_args.args[i]=to;
	to+= ALIGN_SIZE(sizeof(double));
      }
      break;
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    case ROW_RESULT:
2822
    default:
2823
      // This case should never be chosen
2824
      DBUG_ASSERT(0);
2825
      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)
{
2835
  uchar is_null_tmp=0;
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  ulong res_length;
2837
  DBUG_ENTER("udf_handler::val_str");
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  if (get_arguments())
2840
    DBUG_RETURN(0);
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  char * (*func)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *)=
    (char* (*)(UDF_INIT *, UDF_ARGS *, char *, ulong *, uchar *, uchar *))
    u_d->func;

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


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

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

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

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

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

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


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


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


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

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


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


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

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


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


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


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/* Default max_length is max argument length */

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

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

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

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

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

/*
** User level locks
*/

pthread_mutex_t LOCK_user_locks;
static HASH hash_user_locks;

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class User_level_lock
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{
  char *key;
  uint key_length;

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

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

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static bool item_user_lock_inited= 0;

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

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

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

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

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

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

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

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

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

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

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

#endif

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

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

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  pthread_mutex_lock(&LOCK_user_locks);

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

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

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

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

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

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

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

  return !error ? 1 : 0;
}


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

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

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


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longlong Item_func_last_insert_id::val_int()
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{
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  THD *thd= current_thd;
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  DBUG_ASSERT(fixed == 1);
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  if (arg_count)
  {
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    longlong value= args[0]->val_int();
    null_value= args[0]->null_value;
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    /*
      LAST_INSERT_ID(X) must affect the client's mysql_insert_id() as
      documented in the manual. We don't want to touch
      first_successful_insert_id_in_cur_stmt because it would make
      LAST_INSERT_ID(X) take precedence over an generated auto_increment
      value for this row.
    */
    thd->arg_of_last_insert_id_function= TRUE;
    thd->first_successful_insert_id_in_prev_stmt= value;
    return value;
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  }
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  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
3403
  return thd->read_first_successful_insert_id_in_prev_stmt();
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}

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

longlong Item_func_benchmark::val_int()
{
3410
  DBUG_ASSERT(fixed == 1);
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3411
  char buff[MAX_FIELD_WIDTH];
3412
  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:
3419
      (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;
3427
    case ROW_RESULT:
3428
    default:
3429
      // This case should never be chosen
3430 3431
      DBUG_ASSERT(0);
      return 0;
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3432 3433 3434 3435 3436
    }
  }
  return 0;
}

3437

3438 3439
void Item_func_benchmark::print(String *str)
{
3440
  str->append(STRING_WITH_LEN("benchmark("));
3441
  char buffer[20];
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3442 3443 3444
  // my_charset_bin is good enough for numbers
  String st(buffer, sizeof(buffer), &my_charset_bin);
  st.set((ulonglong)loop_count, &my_charset_bin);
3445 3446 3447 3448 3449 3450
  str->append(st);
  str->append(',');
  args[0]->print(str);
  str->append(')');
}

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3451

3452 3453 3454 3455
/* This function is just used to create tests with time gaps */

longlong Item_func_sleep::val_int()
{
3456 3457 3458
  THD *thd= current_thd;
  struct timespec abstime;
  pthread_cond_t cond;
3459
  int error;
3460

3461
  DBUG_ASSERT(fixed == 1);
3462

3463
  double time= args[0]->val_real();
3464 3465 3466 3467 3468 3469 3470 3471
  set_timespec_nsec(abstime, (ulonglong)(time * ULL(1000000000)));

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

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

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3472 3473 3474 3475 3476 3477 3478 3479
  error= 0;
  while (!thd->killed)
  {
    error= pthread_cond_timedwait(&cond, &LOCK_user_locks, &abstime);
    if (error == ETIMEDOUT || error == ETIME)
      break;
    error= 0;
  }
3480 3481 3482 3483 3484 3485 3486 3487 3488

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

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

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3489
  return test(!error); 		// Return 1 killed
3490 3491 3492
}


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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;
3514
    entry->update_query_id=0;
3515
    entry->collation.set(NULL, DERIVATION_IMPLICIT);
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3516
    entry->unsigned_flag= 0;
3517 3518 3519 3520 3521 3522 3523 3524 3525 3526
    /*
      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).
    */
3527
    entry->used_query_id=current_thd->query_id;
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3528 3529
    entry->type=STRING_RESULT;
    memcpy(entry->name.str, name.str, name.length+1);
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3530
    if (my_hash_insert(hash,(byte*) entry))
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3531 3532 3533 3534 3535 3536 3537 3538
    {
      my_free((char*) entry,MYF(0));
      return 0;
    }
  }
  return entry;
}

3539
/*
3540 3541
  When a user variable is updated (in a SET command or a query like
  SELECT @a:= ).
3542
*/
3543

3544
bool Item_func_set_user_var::fix_fields(THD *thd, Item **ref)
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3545
{
3546
  DBUG_ASSERT(fixed == 0);
3547
  /* fix_fields will call Item_func_set_user_var::fix_length_and_dec */
3548
  if (Item_func::fix_fields(thd, ref) ||
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3549
      !(entry= get_variable(&thd->user_vars, name, 1)))
3550
    return TRUE;
3551 3552 3553 3554 3555
  /* 
     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).
  */
3556
  entry->update_query_id= thd->query_id;
3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571
  /*
    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.
  */
3572 3573
  null_item= (args[0]->type() == NULL_ITEM);
  if (!entry->collation.collation || !null_item)
3574 3575
    entry->collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
  collation.set(entry->collation.collation, DERIVATION_IMPLICIT);
3576
  cached_result_type= args[0]->result_type();
3577
  return FALSE;
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3578 3579 3580 3581 3582 3583 3584 3585 3586
}


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;
3587
  collation.set(args[0]->collation.collation, DERIVATION_IMPLICIT);
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3588 3589
}

3590

3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602
/*
  Set value to user variable.

  SYNOPSYS
    update_hash()
    entry    - pointer to structure representing variable
    set_null - should we set NULL value ?
    ptr      - pointer to buffer with new value
    length   - length of new value
    type     - type of new value
    cs       - charset info for new value
    dv       - derivation for new value
3603
    unsigned_arg - indiates if a value of type INT_RESULT is unsigned
3604 3605 3606 3607 3608 3609 3610

  RETURN VALUE
    False - success, True - failure
*/

static bool
update_hash(user_var_entry *entry, bool set_null, void *ptr, uint length,
3611 3612
            Item_result type, CHARSET_INFO *cs, Derivation dv,
            bool unsigned_arg)
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{
3614
  if (set_null)
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  {
    char *pos= (char*) entry+ ALIGN_SIZE(sizeof(user_var_entry));
    if (entry->value && entry->value != pos)
      my_free(entry->value,MYF(0));
3619 3620
    entry->value= 0;
    entry->length= 0;
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3621 3622 3623
  }
  else
  {
3624 3625
    if (type == STRING_RESULT)
      length++;					// Store strings with end \0
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3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646
    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))))
3647
	  return 1;
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3648 3649
      }
    }
3650 3651 3652 3653 3654
    if (type == STRING_RESULT)
    {
      length--;					// Fix length change above
      entry->value[length]= 0;			// Store end \0
    }
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3655
    memcpy(entry->value,ptr,length);
3656 3657
    if (type == DECIMAL_RESULT)
      ((my_decimal*)entry->value)->fix_buffer_pointer();
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3658
    entry->length= length;
3659
    entry->collation.set(cs, dv);
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3660
    entry->unsigned_flag= unsigned_arg;
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  }
3662
  entry->type=type;
3663
  return 0;
3664
}
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3665

3666 3667 3668

bool
Item_func_set_user_var::update_hash(void *ptr, uint length, Item_result type,
3669 3670
                                    CHARSET_INFO *cs, Derivation dv,
                                    bool unsigned_arg)
3671
{
3672 3673 3674 3675 3676 3677
  /*
    If we set a variable explicitely to NULL then keep the old
    result type of the variable
  */
  if ((null_value= args[0]->null_value) && null_item)
    type= entry->type;                          // Don't change type of item
3678
  if (::update_hash(entry, (null_value= args[0]->null_value),
3679
                    ptr, length, type, cs, dv, unsigned_arg))
3680 3681 3682 3683 3684 3685
  {
    current_thd->fatal_error();     // Probably end of memory
    null_value= 1;
    return 1;
  }
  return 0;
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}


3689 3690
/* Get the value of a variable as a double */

3691
double user_var_entry::val_real(my_bool *null_value)
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3692
{
3693 3694 3695 3696 3697 3698 3699 3700
  if ((*null_value= (value == 0)))
    return 0.0;

  switch (type) {
  case REAL_RESULT:
    return *(double*) value;
  case INT_RESULT:
    return (double) *(longlong*) value;
3701 3702 3703 3704 3705 3706
  case DECIMAL_RESULT:
  {
    double result;
    my_decimal2double(E_DEC_FATAL_ERROR, (my_decimal *)value, &result);
    return result;
  }
3707
  case STRING_RESULT:
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3708
    return my_atof(value);                      // This is null terminated
3709 3710 3711
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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3712
  }
3713
  return 0.0;					// Impossible
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}


3717 3718 3719
/* Get the value of a variable as an integer */

longlong user_var_entry::val_int(my_bool *null_value)
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3720
{
3721 3722 3723 3724 3725 3726 3727 3728
  if ((*null_value= (value == 0)))
    return LL(0);

  switch (type) {
  case REAL_RESULT:
    return (longlong) *(double*) value;
  case INT_RESULT:
    return *(longlong*) value;
3729 3730 3731
  case DECIMAL_RESULT:
  {
    longlong result;
3732
    my_decimal2int(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, &result);
3733 3734
    return result;
  }
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3735
  case STRING_RESULT:
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3736 3737 3738 3739
  {
    int error;
    return my_strtoll10(value, (char**) 0, &error);// String is null terminated
  }
3740 3741 3742
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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3743
  }
3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757
  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:
3758
    str->set_real(*(double*) value, decimals, &my_charset_bin);
3759 3760
    break;
  case INT_RESULT:
3761 3762 3763 3764
    if (!unsigned_flag)
      str->set(*(longlong*) value, &my_charset_bin);
    else
      str->set(*(ulonglong*) value, &my_charset_bin);
3765
    break;
3766 3767 3768
  case DECIMAL_RESULT:
    my_decimal2string(E_DEC_FATAL_ERROR, (my_decimal *)value, 0, 0, 0, str);
    break;
3769
  case STRING_RESULT:
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3770
    if (str->copy(value, length, collation.collation))
3771
      str= 0;					// EOM error
3772 3773 3774
  case ROW_RESULT:
    DBUG_ASSERT(1);				// Impossible
    break;
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3775
  }
3776
  return(str);
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}

3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805
/* Get the value of a variable as a decimal */

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

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

3806 3807
/*
  This functions is invoked on SET @variable or @variable:= expression.
3808
  Evaluate (and check expression), store results.
3809 3810 3811 3812 3813

  SYNOPSYS
    Item_func_set_user_var::check()

  NOTES
3814 3815
    For now it always return OK. All problem with value evaluating
    will be caught by thd->net.report_error check in sql_set_variables().
3816 3817

  RETURN
3818
    FALSE OK.
3819 3820 3821
*/

bool
3822
Item_func_set_user_var::check(bool use_result_field)
3823 3824
{
  DBUG_ENTER("Item_func_set_user_var::check");
3825 3826
  if (use_result_field)
    DBUG_ASSERT(result_field);
3827 3828 3829 3830

  switch (cached_result_type) {
  case REAL_RESULT:
  {
3831 3832
    save_result.vreal= use_result_field ? result_field->val_real() :
                        args[0]->val_real();
3833 3834 3835 3836
    break;
  }
  case INT_RESULT:
  {
3837 3838 3839 3840
    save_result.vint= use_result_field ? result_field->val_int() :
                       args[0]->val_int();
    unsigned_flag= use_result_field ? ((Field_num*)result_field)->unsigned_flag:
                    args[0]->unsigned_flag;
3841 3842 3843 3844
    break;
  }
  case STRING_RESULT:
  {
3845 3846
    save_result.vstr= use_result_field ? result_field->val_str(&value) :
                       args[0]->val_str(&value);
3847 3848
    break;
  }
3849 3850
  case DECIMAL_RESULT:
  {
3851 3852 3853
    save_result.vdec= use_result_field ?
                       result_field->val_decimal(&decimal_buff) :
                       args[0]->val_decimal(&decimal_buff);
3854 3855
    break;
  }
3856 3857
  case ROW_RESULT:
  default:
3858
    // This case should never be chosen
3859 3860 3861
    DBUG_ASSERT(0);
    break;
  }
3862
  DBUG_RETURN(FALSE);
3863 3864
}

3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876

/*
  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
3877
    0	OK
3878 3879 3880 3881
    1	EOM Error

*/

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3882 3883 3884
bool
Item_func_set_user_var::update()
{
3885 3886 3887 3888
  bool res;
  DBUG_ENTER("Item_func_set_user_var::update");
  LINT_INIT(res);

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3889 3890
  switch (cached_result_type) {
  case REAL_RESULT:
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3891
  {
3892
    res= update_hash((void*) &save_result.vreal,sizeof(save_result.vreal),
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3893
		     REAL_RESULT, &my_charset_bin, DERIVATION_IMPLICIT, 0);
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3894
    break;
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3895
  }
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3896
  case INT_RESULT:
3897
  {
3898
    res= update_hash((void*) &save_result.vint, sizeof(save_result.vint),
3899
                     INT_RESULT, &my_charset_bin, DERIVATION_IMPLICIT,
3900
                     unsigned_flag);
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3901
    break;
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3902
  }
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3903
  case STRING_RESULT:
3904
  {
3905
    if (!save_result.vstr)					// Null value
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3906
      res= update_hash((void*) 0, 0, STRING_RESULT, &my_charset_bin,
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3907
		       DERIVATION_IMPLICIT, 0);
3908
    else
3909 3910 3911
      res= update_hash((void*) save_result.vstr->ptr(),
		       save_result.vstr->length(), STRING_RESULT,
		       save_result.vstr->charset(),
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3912
		       DERIVATION_IMPLICIT, 0);
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3913 3914
    break;
  }
3915 3916 3917 3918
  case DECIMAL_RESULT:
  {
    if (!save_result.vdec)					// Null value
      res= update_hash((void*) 0, 0, DECIMAL_RESULT, &my_charset_bin,
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3919
                       DERIVATION_IMPLICIT, 0);
3920 3921 3922
    else
      res= update_hash((void*) save_result.vdec,
                       sizeof(my_decimal), DECIMAL_RESULT,
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3923
                       &my_charset_bin, DERIVATION_IMPLICIT, 0);
3924 3925
    break;
  }
3926
  case ROW_RESULT:
3927
  default:
3928
    // This case should never be chosen
3929 3930 3931
    DBUG_ASSERT(0);
    break;
  }
3932
  DBUG_RETURN(res);
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3933 3934 3935
}


3936
double Item_func_set_user_var::val_real()
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3937
{
3938
  DBUG_ASSERT(fixed == 1);
3939
  check(0);
3940
  update();					// Store expression
3941
  return entry->val_real(&null_value);
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3942 3943
}

3944
longlong Item_func_set_user_var::val_int()
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3945
{
3946
  DBUG_ASSERT(fixed == 1);
3947
  check(0);
3948 3949
  update();					// Store expression
  return entry->val_int(&null_value);
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3950 3951
}

3952
String *Item_func_set_user_var::val_str(String *str)
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3953
{
3954
  DBUG_ASSERT(fixed == 1);
3955
  check(0);
3956 3957
  update();					// Store expression
  return entry->val_str(&null_value, str, decimals);
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3958 3959 3960
}


3961 3962 3963
my_decimal *Item_func_set_user_var::val_decimal(my_decimal *val)
{
  DBUG_ASSERT(fixed == 1);
3964
  check(0);
3965 3966 3967 3968 3969
  update();					// Store expression
  return entry->val_decimal(&null_value, val);
}


3970 3971
void Item_func_set_user_var::print(String *str)
{
3972
  str->append(STRING_WITH_LEN("(@"));
3973
  str->append(name.str, name.length);
3974
  str->append(STRING_WITH_LEN(":="));
3975 3976 3977 3978 3979
  args[0]->print(str);
  str->append(')');
}


3980 3981
void Item_func_set_user_var::print_as_stmt(String *str)
{
3982
  str->append(STRING_WITH_LEN("set @"));
3983
  str->append(name.str, name.length);
3984
  str->append(STRING_WITH_LEN(":="));
3985 3986 3987 3988
  args[0]->print(str);
  str->append(')');
}

3989 3990 3991 3992 3993 3994 3995 3996 3997 3998
bool Item_func_set_user_var::send(Protocol *protocol, String *str_arg)
{
  if (result_field)
  {
    check(1);
    update();
    return protocol->store(result_field);
  }
  return Item::send(protocol, str_arg);
}
3999

4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011
void Item_func_set_user_var::make_field(Send_field *tmp_field)
{
  if (result_field)
  {
    result_field->make_field(tmp_field);
    DBUG_ASSERT(tmp_field->table_name != 0);
    if (Item::name)
      tmp_field->col_name=Item::name;               // Use user supplied name
  }
  else
    Item::make_field(tmp_field);
}
4012

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4013 4014 4015
String *
Item_func_get_user_var::val_str(String *str)
{
4016
  DBUG_ASSERT(fixed == 1);
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vva@eagle.mysql.r18.ru committed
4017
  DBUG_ENTER("Item_func_get_user_var::val_str");
4018
  if (!var_entry)
4019
    DBUG_RETURN((String*) 0);			// No such variable
4020
  DBUG_RETURN(var_entry->val_str(&null_value, str, decimals));
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4021 4022 4023
}


4024
double Item_func_get_user_var::val_real()
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4025
{
4026
  DBUG_ASSERT(fixed == 1);
4027 4028
  if (!var_entry)
    return 0.0;					// No such variable
4029 4030 4031 4032 4033 4034 4035 4036 4037 4038
  return (var_entry->val_real(&null_value));
}


my_decimal *Item_func_get_user_var::val_decimal(my_decimal *dec)
{
  DBUG_ASSERT(fixed == 1);
  if (!var_entry)
    return 0;
  return var_entry->val_decimal(&null_value, dec);
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4039 4040 4041 4042 4043
}


longlong Item_func_get_user_var::val_int()
{
4044
  DBUG_ASSERT(fixed == 1);
4045 4046 4047
  if (!var_entry)
    return LL(0);				// No such variable
  return (var_entry->val_int(&null_value));
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4048 4049 4050
}


4051
/*
4052 4053 4054 4055 4056 4057 4058 4059 4060 4061
  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.

4062 4063 4064 4065
  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).
4066

4067
  RETURN
4068
    0  OK
4069
    1  Failed to put appropriate record into binary log
4070

4071 4072
*/

4073 4074
int get_var_with_binlog(THD *thd, enum_sql_command sql_command,
                        LEX_STRING &name, user_var_entry **out_entry)
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4075
{
4076
  BINLOG_USER_VAR_EVENT *user_var_event;
4077 4078
  user_var_entry *var_entry;
  var_entry= get_variable(&thd->user_vars, name, 0);
4079 4080

  if (!(opt_bin_log && is_update_query(sql_command)))
4081 4082 4083 4084
  {
    *out_entry= var_entry;
    return 0;
  }
4085 4086

  if (!var_entry)
4087
  {
4088
    /*
4089 4090 4091 4092
      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).
4093 4094
      We create it like if it had been explicitly set with SET before.
      The 'new' mimics what sql_yacc.yy does when 'SET @a=10;'.
4095 4096 4097
      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();
4098 4099
      this would save memory and time; but calling sql_set_variables() makes
      one unique place to maintain (sql_set_variables()). 
4100 4101 4102

      Manipulation with lex is necessary since free_underlaid_joins
      is going to release memory belonging to the main query.
4103 4104 4105
    */

    List<set_var_base> tmp_var_list;
4106 4107 4108
    LEX *sav_lex= thd->lex, lex_tmp;
    thd->lex= &lex_tmp;
    lex_start(thd, NULL, 0);
4109 4110
    tmp_var_list.push_back(new set_var_user(new Item_func_set_user_var(name,
                                                                       new Item_null())));
4111 4112
    /* Create the variable */
    if (sql_set_variables(thd, &tmp_var_list))
4113 4114
    {
      thd->lex= sav_lex;
4115
      goto err;
4116 4117
    }
    thd->lex= sav_lex;
4118 4119 4120
    if (!(var_entry= get_variable(&thd->user_vars, name, 0)))
      goto err;
  }
4121 4122
  else if (var_entry->used_query_id == thd->query_id ||
           mysql_bin_log.is_query_in_union(thd, var_entry->used_query_id))
4123 4124 4125 4126 4127 4128 4129 4130 4131
  {
    /* 
       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;
  }
4132 4133 4134 4135

  uint size;
  /*
    First we need to store value of var_entry, when the next situation
4136
    appears:
4137 4138
    > set @a:=1;
    > insert into t1 values (@a), (@a:=@a+1), (@a:=@a+1);
4139 4140 4141 4142 4143 4144
    We have to write to binlog value @a= 1.
    
    We allocate the user_var_event on user_var_events_alloc pool, not on
    the this-statement-execution pool because in SPs user_var_event objects 
    may need to be valid after current [SP] statement execution pool is
    destroyed.
4145
  */
4146 4147 4148
  size= ALIGN_SIZE(sizeof(BINLOG_USER_VAR_EVENT)) + var_entry->length;
  if (!(user_var_event= (BINLOG_USER_VAR_EVENT *)
        alloc_root(thd->user_var_events_alloc, size)))
4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160
    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;
4161
  }
4162 4163 4164 4165 4166 4167 4168 4169 4170 4171
  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;
4172 4173 4174
  
  *out_entry= var_entry;
  return 0;
4175

4176
err:
4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188
  *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;
4189

4190
  error= get_var_with_binlog(thd, thd->lex->sql_command, name, &var_entry);
4191 4192

  if (var_entry)
4193
  {
4194
    collation.set(var_entry->collation);
4195 4196 4197
    switch (var_entry->type) {
    case REAL_RESULT:
      max_length= DBL_DIG + 8;
4198
      break;
4199 4200
    case INT_RESULT:
      max_length= MAX_BIGINT_WIDTH;
4201
      decimals=0;
4202 4203 4204 4205
      break;
    case STRING_RESULT:
      max_length= MAX_BLOB_WIDTH;
      break;
4206
    case DECIMAL_RESULT:
4207 4208
      max_length= DECIMAL_MAX_STR_LENGTH;
      decimals= DECIMAL_MAX_SCALE;
4209
      break;
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4210
    case ROW_RESULT:                            // Keep compiler happy
4211 4212
    default:
      DBUG_ASSERT(0);
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monty@mysql.com committed
4213
      break;
4214 4215
    }
  }
4216
  else
4217 4218
  {
    collation.set(&my_charset_bin, DERIVATION_IMPLICIT);
4219
    null_value= 1;
4220
  }
4221

4222 4223
  if (error)
    thd->fatal_error();
4224

4225
  return;
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4226 4227 4228
}


4229
bool Item_func_get_user_var::const_item() const
4230
{
4231
  return (!var_entry || current_thd->query_id != var_entry->update_query_id);
4232
}
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4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244


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;
}

4245 4246 4247

void Item_func_get_user_var::print(String *str)
{
4248
  str->append(STRING_WITH_LEN("(@"));
4249 4250 4251 4252
  str->append(name.str,name.length);
  str->append(')');
}

4253

4254
bool Item_func_get_user_var::eq(const Item *item, bool binary_cmp) const
4255 4256 4257 4258 4259 4260
{
  /* 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 ||
4261
      ((Item_func*) item)->functype() != functype())
4262 4263 4264 4265 4266 4267 4268
    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));
}


4269
bool Item_func_get_user_var::set_value(THD *thd,
4270
                                       sp_rcontext */*ctx*/, Item **it)
4271
{
4272
  Item_func_set_user_var *suv= new Item_func_set_user_var(get_name(), *it);
4273 4274 4275 4276
  /*
    Item_func_set_user_var is not fixed after construction, call
    fix_fields().
  */
4277
  return (!suv || suv->fix_fields(thd, it) || suv->check(0) || suv->update());
4278 4279 4280
}


4281
bool Item_user_var_as_out_param::fix_fields(THD *thd, Item **ref)
4282 4283
{
  DBUG_ASSERT(fixed == 0);
4284
  if (Item::fix_fields(thd, ref) ||
4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301
      !(entry= get_variable(&thd->user_vars, name, 1)))
    return TRUE;
  entry->type= STRING_RESULT;
  /*
    Let us set the same collation which is used for loading
    of fields in LOAD DATA INFILE.
    (Since Item_user_var_as_out_param is used only there).
  */
  entry->collation.set(thd->variables.collation_database);
  entry->update_query_id= thd->query_id;
  return FALSE;
}


void Item_user_var_as_out_param::set_null_value(CHARSET_INFO* cs)
{
  if (::update_hash(entry, TRUE, 0, 0, STRING_RESULT, cs,
4302
                    DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
4303 4304 4305 4306 4307 4308 4309 4310
    current_thd->fatal_error();			// Probably end of memory
}


void Item_user_var_as_out_param::set_value(const char *str, uint length,
                                           CHARSET_INFO* cs)
{
  if (::update_hash(entry, FALSE, (void*)str, length, STRING_RESULT, cs,
4311
                    DERIVATION_IMPLICIT, 0 /* unsigned_arg */))
4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350
    current_thd->fatal_error();			// Probably end of memory
}


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


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


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


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


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


4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362
Item_func_get_system_var::
Item_func_get_system_var(sys_var *var_arg, enum_var_type var_type_arg,
                       LEX_STRING *component_arg, const char *name_arg,
                       size_t name_len_arg)
  :var(var_arg), var_type(var_type_arg), component(*component_arg)
{
  /* set_name() will allocate the name */
  set_name(name_arg, name_len_arg, system_charset_info);
}


bool
4363
Item_func_get_system_var::fix_fields(THD *thd, Item **ref)
4364
{
4365
  Item *item;
4366
  DBUG_ENTER("Item_func_get_system_var::fix_fields");
4367

4368 4369 4370 4371 4372
  /*
    Evaluate the system variable and substitute the result (a basic constant)
    instead of this item. If the variable can not be evaluated,
    the error is reported in sys_var::item().
  */
4373
  if (!(item= var->item(thd, var_type, &component)))
4374 4375 4376 4377 4378 4379 4380 4381
    DBUG_RETURN(1);                             // Impossible
  item->set_name(name, 0, system_charset_info); // don't allocate a new name
  thd->change_item_tree(ref, item);

  DBUG_RETURN(0);
}


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4382 4383
longlong Item_func_inet_aton::val_int()
{
4384
  DBUG_ASSERT(fixed == 1);
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4385 4386 4387 4388 4389
  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];
4390
  int dot_count= 0;
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4391

4392
  String *s,tmp(buff,sizeof(buff),&my_charset_bin);
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4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408
  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 == '.')
    {
4409
      dot_count++;
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4410 4411 4412 4413 4414 4415 4416
      result= (result << 8) + (ulonglong) byte_result;
      byte_result = 0;
    }
    else
      goto err;					// Invalid character
  }
  if (c != '.')					// IP number can't end on '.'
4417
  {
4418 4419 4420 4421 4422 4423
    /*
      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
    */
4424
    switch (dot_count) {
4425 4426
    case 1: result<<= 8; /* Fall through */
    case 2: result<<= 8; /* Fall through */
4427
    }
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4428
    return (result << 8) + (ulonglong) byte_result;
4429
  }
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4430 4431 4432 4433 4434 4435

err:
  null_value=1;
  return 0;
}

4436

4437
void Item_func_match::init_search(bool no_order)
4438
{
4439
  DBUG_ENTER("Item_func_match::init_search");
4440 4441

  /* Check if init_search() has been called before */
4442
  if (ft_handler)
4443
    DBUG_VOID_RETURN;
4444

4445
  if (key == NO_SUCH_KEY)
4446 4447
  {
    List<Item> fields;
4448
    fields.push_back(new Item_string(" ",1, cmp_collation.collation));
4449 4450
    for (uint i=1; i < arg_count; i++)
      fields.push_back(args[i]);
4451
    concat=new Item_func_concat_ws(fields);
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4452 4453 4454
    /*
      Above function used only to get value and do not need fix_fields for it:
      Item_string - basic constant
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4455 4456
      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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4457 4458
    */
    concat->quick_fix_field();
4459
  }
4460

4461 4462
  if (master)
  {
4463 4464
    join_key=master->join_key=join_key|master->join_key;
    master->init_search(no_order);
4465 4466
    ft_handler=master->ft_handler;
    join_key=master->join_key;
4467
    DBUG_VOID_RETURN;
4468 4469
  }

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4470
  String *ft_tmp= 0;
4471

4472
  // MATCH ... AGAINST (NULL) is meaningless, but possible
4473
  if (!(ft_tmp=key_item()->val_str(&value)))
4474
  {
4475 4476
    ft_tmp= &value;
    value.set("",0,cmp_collation.collation);
4477 4478
  }

4479 4480
  if (ft_tmp->charset() != cmp_collation.collation)
  {
4481
    uint dummy_errors;
4482
    search_value.copy(ft_tmp->ptr(), ft_tmp->length(), ft_tmp->charset(),
4483
                      cmp_collation.collation, &dummy_errors);
4484
    ft_tmp= &search_value;
4485 4486
  }

4487 4488
  if (join_key && !no_order)
    flags|=FT_SORTED;
4489
  ft_handler=table->file->ft_init_ext(flags, key, ft_tmp);
4490 4491 4492

  if (join_key)
    table->file->ft_handler=ft_handler;
4493 4494

  DBUG_VOID_RETURN;
4495 4496
}

4497

4498
bool Item_func_match::fix_fields(THD *thd, Item **ref)
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4499
{
4500
  DBUG_ASSERT(fixed == 0);
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4501
  Item *item;
4502
  LINT_INIT(item);				// Safe as arg_count is > 1
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4503

4504 4505 4506
  maybe_null=1;
  join_key=0;

4507 4508 4509 4510 4511
  /*
    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.
4512
   */
4513
  if (Item_func::fix_fields(thd, ref) ||
4514
      !args[0]->const_during_execution())
4515 4516
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"AGAINST");
4517
    return TRUE;
4518
  }
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4519

4520 4521
  const_item_cache=0;
  for (uint i=1 ; i < arg_count ; i++)
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4522
  {
4523
    item=args[i];
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4524
    if (item->type() == Item::REF_ITEM)
4525 4526
      args[i]= item= *((Item_ref *)item)->ref;
    if (item->type() != Item::FIELD_ITEM)
4527
      key=NO_SUCH_KEY;
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4528
  }
4529 4530
  /*
    Check that all columns come from the same table.
4531
    We've already checked that columns in MATCH are fields so
4532 4533 4534
    PARAM_TABLE_BIT can only appear from AGAINST argument.
  */
  if ((used_tables_cache & ~PARAM_TABLE_BIT) != item->used_tables())
4535
    key=NO_SUCH_KEY;
4536

4537
  if (key == NO_SUCH_KEY && !(flags & FT_BOOL))
4538 4539
  {
    my_error(ER_WRONG_ARGUMENTS,MYF(0),"MATCH");
4540
    return TRUE;
4541
  }
4542
  table=((Item_field *)item)->field->table;
4543
  if (!(table->file->ha_table_flags() & HA_CAN_FULLTEXT))
4544
  {
monty@mysql.com's avatar
monty@mysql.com committed
4545
    my_error(ER_TABLE_CANT_HANDLE_FT, MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4546
    return 1;
4547
  }
4548
  table->fulltext_searched=1;
4549 4550
  return agg_arg_collations_for_comparison(cmp_collation,
                                           args+1, arg_count-1, 0);
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4551
}
4552

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4553 4554 4555
bool Item_func_match::fix_index()
{
  Item_field *item;
4556
  uint ft_to_key[MAX_KEY], ft_cnt[MAX_KEY], fts=0, keynr;
4557
  uint max_cnt=0, mkeys=0, i;
4558

4559
  if (key == NO_SUCH_KEY)
4560
    return 0;
4561 4562 4563
  
  if (!table) 
    goto err;
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4564

4565
  for (keynr=0 ; keynr < table->s->keys ; keynr++)
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bk@work.mysql.com committed
4566
  {
4567
    if ((table->key_info[keynr].flags & HA_FULLTEXT) &&
4568
        (table->keys_in_use_for_query.is_set(keynr)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4569
    {
4570
      ft_to_key[fts]=keynr;
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4571 4572 4573 4574 4575 4576
      ft_cnt[fts]=0;
      fts++;
    }
  }

  if (!fts)
4577
    goto err;
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bk@work.mysql.com committed
4578

4579
  for (i=1; i < arg_count; i++)
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4580
  {
4581
    item=(Item_field*)args[i];
4582
    for (keynr=0 ; keynr < fts ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4583
    {
4584
      KEY *ft_key=&table->key_info[ft_to_key[keynr]];
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4585 4586 4587 4588 4589
      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))
4590
	  ft_cnt[keynr]++;
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4591 4592 4593 4594
      }
    }
  }

4595
  for (keynr=0 ; keynr < fts ; keynr++)
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4596
  {
4597
    if (ft_cnt[keynr] > max_cnt)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4598
    {
4599
      mkeys=0;
4600 4601
      max_cnt=ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4602 4603
      continue;
    }
4604
    if (max_cnt && ft_cnt[keynr] == max_cnt)
4605 4606
    {
      mkeys++;
4607 4608
      ft_cnt[mkeys]=ft_cnt[keynr];
      ft_to_key[mkeys]=ft_to_key[keynr];
4609
      continue;
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4610 4611 4612
    }
  }

4613
  for (keynr=0 ; keynr <= mkeys ; keynr++)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4614
  {
4615 4616
    // partial keys doesn't work
    if (max_cnt < arg_count-1 ||
4617
        max_cnt < table->key_info[ft_to_key[keynr]].key_parts)
4618
      continue;
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bk@work.mysql.com committed
4619

4620
    key=ft_to_key[keynr];
4621

4622 4623 4624
    return 0;
  }

4625
err:
4626
  if (flags & FT_BOOL)
4627
  {
4628
    key=NO_SUCH_KEY;
4629 4630
    return 0;
  }
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bell@sanja.is.com.ua committed
4631 4632
  my_message(ER_FT_MATCHING_KEY_NOT_FOUND,
             ER(ER_FT_MATCHING_KEY_NOT_FOUND), MYF(0));
4633
  return 1;
4634 4635
}

4636

4637
bool Item_func_match::eq(const Item *item, bool binary_cmp) const
4638
{
4639 4640
  if (item->type() != FUNC_ITEM ||
      ((Item_func*)item)->functype() != FT_FUNC ||
4641
      flags != ((Item_func_match*)item)->flags)
4642 4643 4644 4645 4646
    return 0;

  Item_func_match *ifm=(Item_func_match*) item;

  if (key == ifm->key && table == ifm->table &&
4647
      key_item()->eq(ifm->key_item(), binary_cmp))
4648
    return 1;
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4649 4650 4651 4652

  return 0;
}

4653

4654
double Item_func_match::val_real()
4655
{
4656
  DBUG_ASSERT(fixed == 1);
4657
  DBUG_ENTER("Item_func_match::val");
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monty@hundin.mysql.fi committed
4658
  if (ft_handler == NULL)
4659
    DBUG_RETURN(-1.0);
4660

4661
  if (key != NO_SUCH_KEY && table->null_row) /* NULL row from an outer join */
monty@mysql.com's avatar
monty@mysql.com committed
4662
    DBUG_RETURN(0.0);
4663

4664 4665 4666
  if (join_key)
  {
    if (table->file->ft_handler)
4667
      DBUG_RETURN(ft_handler->please->get_relevance(ft_handler));
4668 4669 4670
    join_key=0;
  }

4671
  if (key == NO_SUCH_KEY)
4672
  {
4673 4674
    String *a= concat->val_str(&value);
    if ((null_value= (a == 0)))
4675 4676 4677
      DBUG_RETURN(0);
    DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
				      (byte *)a->ptr(), a->length()));
4678
  }
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monty@mysql.com committed
4679 4680
  DBUG_RETURN(ft_handler->please->find_relevance(ft_handler,
                                                 table->record[0], 0));
4681 4682
}

4683 4684
void Item_func_match::print(String *str)
{
4685
  str->append(STRING_WITH_LEN("(match "));
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4686
  print_args(str, 1);
4687
  str->append(STRING_WITH_LEN(" against ("));
4688
  args[0]->print(str);
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4689
  if (flags & FT_BOOL)
4690
    str->append(STRING_WITH_LEN(" in boolean mode"));
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bell@sanja.is.com.ua committed
4691
  else if (flags & FT_EXPAND)
4692 4693
    str->append(STRING_WITH_LEN(" with query expansion"));
  str->append(STRING_WITH_LEN("))"));
4694
}
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4695

4696 4697
longlong Item_func_bit_xor::val_int()
{
4698
  DBUG_ASSERT(fixed == 1);
4699 4700
  ulonglong arg1= (ulonglong) args[0]->val_int();
  ulonglong arg2= (ulonglong) args[1]->val_int();
4701
  if ((null_value= (args[0]->null_value || args[1]->null_value)))
4702 4703 4704 4705
    return 0;
  return (longlong) (arg1 ^ arg2);
}

4706

4707 4708 4709 4710
/***************************************************************************
  System variables
****************************************************************************/

4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727
/*
  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
*/
4728

4729 4730 4731

Item *get_system_var(THD *thd, enum_var_type var_type, LEX_STRING name,
		     LEX_STRING component)
4732
{
4733 4734 4735
  sys_var *var;
  LEX_STRING *base_name, *component_name;

4736 4737 4738 4739 4740 4741 4742 4743 4744 4745
  if (component.str)
  {
    base_name= &component;
    component_name= &name;
  }
  else
  {
    base_name= &name;
    component_name= &component;			// Empty string
  }
4746

4747
  if (!(var= find_sys_var(base_name->str, base_name->length)))
4748
    return 0;
4749 4750 4751 4752
  if (component.str)
  {
    if (!var->is_struct())
    {
4753
      my_error(ER_VARIABLE_IS_NOT_STRUCT, MYF(0), base_name->str);
4754 4755 4756
      return 0;
    }
  }
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4757
  thd->lex->uncacheable(UNCACHEABLE_SIDEEFFECT);
4758

4759 4760
  set_if_smaller(component_name->length, MAX_SYS_VAR_LENGTH);

4761
  return new Item_func_get_system_var(var, var_type, component_name,
4762
                                      NULL, 0);
4763 4764 4765
}


4766 4767
/*
  Check a user level lock.
4768 4769 4770 4771 4772 4773 4774 4775

  SYNOPSIS:
    val_int()

  RETURN VALUES
    1		Available
    0		Already taken
    NULL	Error
4776 4777
*/

4778
longlong Item_func_is_free_lock::val_int()
4779
{
4780
  DBUG_ASSERT(fixed == 1);
4781
  String *res=args[0]->val_str(&value);
4782
  User_level_lock *ull;
4783 4784

  null_value=0;
4785
  if (!res || !res->length())
4786 4787 4788 4789 4790 4791
  {
    null_value=1;
    return 0;
  }
  
  pthread_mutex_lock(&LOCK_user_locks);
4792
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
4793 4794 4795 4796 4797 4798
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 1;
  return 0;
}
4799

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SCRUM  
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4800 4801
longlong Item_func_is_used_lock::val_int()
{
4802
  DBUG_ASSERT(fixed == 1);
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
4803
  String *res=args[0]->val_str(&value);
4804
  User_level_lock *ull;
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SCRUM  
hf@genie.(none) committed
4805 4806 4807 4808 4809 4810

  null_value=1;
  if (!res || !res->length())
    return 0;
  
  pthread_mutex_lock(&LOCK_user_locks);
4811
  ull= (User_level_lock *) hash_search(&hash_user_locks, (byte*) res->ptr(),
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SCRUM  
hf@genie.(none) committed
4812 4813 4814 4815 4816 4817 4818 4819 4820
			  res->length());
  pthread_mutex_unlock(&LOCK_user_locks);
  if (!ull || !ull->locked)
    return 0;

  null_value=0;
  return ull->thread_id;
}

4821

4822 4823 4824 4825 4826 4827 4828 4829 4830
longlong Item_func_row_count::val_int()
{
  DBUG_ASSERT(fixed == 1);
  THD *thd= current_thd;

  return thd->row_count_func;
}


4831 4832 4833
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg, sp_name *name)
  :Item_func(), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4834
{
4835
  maybe_null= 1;
4836
  m_name->init_qname(current_thd);
4837 4838
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
  dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
4839 4840
}

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4841

4842 4843 4844 4845
Item_func_sp::Item_func_sp(Name_resolution_context *context_arg,
                           sp_name *name, List<Item> &list)
  :Item_func(list), context(context_arg), m_name(name), m_sp(NULL),
   result_field(NULL)
4846
{
4847
  maybe_null= 1;
4848
  m_name->init_qname(current_thd);
4849 4850
  dummy_table= (TABLE*) sql_calloc(sizeof(TABLE)+ sizeof(TABLE_SHARE));
  dummy_table->s= (TABLE_SHARE*) (dummy_table+1);
4851 4852
}

4853

4854 4855 4856 4857 4858 4859 4860 4861
void
Item_func_sp::cleanup()
{
  if (result_field)
  {
    delete result_field;
    result_field= NULL;
  }
4862
  m_sp= NULL;
4863 4864
  Item_func::cleanup();
}
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4865

4866 4867 4868
const char *
Item_func_sp::func_name() const
{
4869
  THD *thd= current_thd;
4870
  /* Calculate length to avoid reallocation of string for sure */
4871 4872 4873 4874
  uint len= ((m_name->m_db.length +
              m_name->m_name.length)*2 + //characters*quoting
             2 +                         // ` and `
             1 +                         // .
4875 4876
             1 +                         // end of string
             ALIGN_SIZE(1));             // to avoid String reallocation
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4877
  String qname((char *)alloc_root(thd->mem_root, len), len,
4878
               system_charset_info);
4879

4880 4881 4882 4883 4884
  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();
4885 4886
}

4887

4888 4889 4890
Field *
Item_func_sp::sp_result_field(void) const
{
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pem@mysql.comhem.se committed
4891
  Field *field;
4892
  DBUG_ENTER("Item_func_sp::sp_result_field");
4893 4894 4895 4896
  DBUG_PRINT("info", ("sp: %s, flags: %x, level: %lu",
                      (m_sp ? "YES" : "NO"),
                      (m_sp ? m_sp->m_flags : (uint)0),
                      (m_sp ? m_sp->m_recursion_level : (ulong)0)));
4897 4898

  if (!m_sp)
4899
  {
4900 4901 4902
    THD *thd= current_thd;
    if (!(m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                &thd->sp_func_cache, TRUE)))
4903
    {
4904 4905
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
      DBUG_RETURN(0);
4906 4907
    }
  }
4908
  if (!dummy_table->alias)
4909 4910
  {
    char *empty_name= (char *) "";
4911 4912
    dummy_table->alias= empty_name;
    dummy_table->maybe_null= maybe_null;
4913
    dummy_table->in_use= current_thd;
4914
    dummy_table->copy_blobs= TRUE;
4915 4916 4917
    dummy_table->s->table_cache_key.str = empty_name;
    dummy_table->s->table_name.str= empty_name;
    dummy_table->s->db.str= empty_name;
4918
  }
4919 4920 4921
  if (!(field= m_sp->create_result_field(max_length, name, dummy_table)))
    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

4922
  DBUG_RETURN(field);
4923 4924 4925
}


4926 4927 4928 4929 4930 4931 4932 4933
/*
  Execute function & store value in field

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

4934
bool
4935 4936
Item_func_sp::execute(Field **flp)
{
4937
  THD *thd= current_thd;
4938
  Field *f;
4939 4940 4941 4942 4943 4944

  /*
    Get field in virtual tmp table to store result. Create the field if
    invoked first time.
  */
  
4945 4946
  if (!(f= *flp))
  {
4947 4948
    if (!(*flp= f= sp_result_field()))
    {
4949 4950 4951
      /* Error set by sp_result_field() */
      null_value= 1;
      return TRUE;
4952 4953 4954
    }

    f->move_field((f->pack_length() > sizeof(result_buf)) ?
4955 4956 4957 4958
                  sql_alloc(f->pack_length()) : result_buf);
    f->null_ptr= (uchar *)&null_value;
    f->null_bit= 1;
  }
4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973

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

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

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

  null_value= f->is_null();

  return null_value;
4974 4975 4976
}


4977 4978
bool
Item_func_sp::execute_impl(THD *thd, Field *return_value_fld)
4979
{
4980
  bool err_status= TRUE;
4981
  Sub_statement_state statement_state;
4982 4983 4984
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  Security_context *save_security_ctx= thd->security_ctx;
#endif
4985

4986 4987
  DBUG_ENTER("Item_func_sp::execute_impl");

4988 4989 4990 4991 4992 4993 4994
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (context->security_ctx)
  {
    /* Set view definer security context */
    thd->security_ctx= context->security_ctx;
  }
#endif
4995
  if (find_and_check_access(thd))
4996
    goto error;
4997

4998 4999 5000 5001 5002
  /*
    Disable the binlogging if this is not a SELECT statement. If this is a
    SELECT, leave binlogging on, so execute_function() code writes the
    function call into binlog.
  */
5003
  thd->reset_sub_statement_state(&statement_state, SUB_STMT_FUNCTION);
5004
  err_status= m_sp->execute_function(thd, args, arg_count, return_value_fld);
5005
  thd->restore_sub_statement_state(&statement_state);
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5006

5007
error:
5008
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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5009
  thd->security_ctx= save_security_ctx;
5010
#endif
5011

5012
  DBUG_RETURN(err_status);
5013 5014
}

5015

5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031
void
Item_func_sp::make_field(Send_field *tmp_field)
{
  Field *field;
  DBUG_ENTER("Item_func_sp::make_field");
  if ((field= sp_result_field()))
  {
    field->make_field(tmp_field);
    delete field;
    DBUG_VOID_RETURN;
  }
  init_make_field(tmp_field, MYSQL_TYPE_VARCHAR);  
  DBUG_VOID_RETURN;
}


5032 5033
enum enum_field_types
Item_func_sp::field_type() const
5034
{
5035
  Field *field;
5036
  DBUG_ENTER("Item_func_sp::field_type");
5037

5038 5039
  if (result_field)
    DBUG_RETURN(result_field->type());
5040
  if ((field= sp_result_field()))
5041
  {
5042 5043 5044
    enum_field_types result= field->type();
    delete field;
    DBUG_RETURN(result);
5045
  }
5046
  DBUG_RETURN(MYSQL_TYPE_VARCHAR);
5047 5048
}

5049

5050 5051
Item_result
Item_func_sp::result_type() const
5052
{
5053
  Field *field;
5054 5055
  DBUG_ENTER("Item_func_sp::result_type");
  DBUG_PRINT("info", ("m_sp = %p", m_sp));
5056

5057 5058
  if (result_field)
    DBUG_RETURN(result_field->result_type());
5059
  if ((field= sp_result_field()))
5060
  {
5061 5062 5063
    Item_result result= field->result_type();
    delete field;
    DBUG_RETURN(result);
5064
  }
5065
  DBUG_RETURN(STRING_RESULT);
5066 5067 5068 5069 5070
}

void
Item_func_sp::fix_length_and_dec()
{
5071
  Field *field;
5072 5073
  DBUG_ENTER("Item_func_sp::fix_length_and_dec");

5074 5075 5076
  if (result_field)
  {
    decimals= result_field->decimals();
5077
    max_length= result_field->field_length;
5078
    collation.set(result_field->charset());
5079 5080 5081
    DBUG_VOID_RETURN;
  }

5082
  if (!(field= sp_result_field()))
5083 5084
  {
    context->process_error(current_thd);
5085
    DBUG_VOID_RETURN;
5086
  }
5087
  decimals= field->decimals();
monty@mishka.local's avatar
merge  
monty@mishka.local committed
5088
  max_length= field->field_length;
5089
  collation.set(field->charset());
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merge  
monty@mishka.local committed
5090
  maybe_null= 1;
5091
  delete field;
5092 5093
  DBUG_VOID_RETURN;
}
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5094 5095


5096 5097 5098
longlong Item_func_found_rows::val_int()
{
  DBUG_ASSERT(fixed == 1);
5099
  return current_thd->found_rows();
5100
}
5101

5102

5103 5104 5105
Field *
Item_func_sp::tmp_table_field(TABLE *t_arg)
{
5106
  Field *field= 0;
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  DBUG_ENTER("Item_func_sp::tmp_table_field");

  if (m_sp)
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    field= m_sp->create_result_field(max_length, (const char*) name, t_arg);
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  if (!field) 
    field= Item_func::tmp_table_field(t_arg);
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  if (!field)
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    my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));

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  DBUG_RETURN(field);
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}
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/*
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  Find the function and check access rights to the function
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  SYNOPSIS
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    find_and_check_access()
    thd           thread handler
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  RETURN
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    FALSE    Access granted
    TRUE     Requested access can't be granted or function doesn't exists
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  NOTES
    Checks if requested access to function can be granted to user.
    If function isn't found yet, it searches function first.
    If function can't be found or user don't have requested access
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    error is raised.
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*/
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bool
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Item_func_sp::find_and_check_access(THD *thd)
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{
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  if (! m_sp && ! (m_sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, m_name,
                                         &thd->sp_func_cache, TRUE)))
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  {
    my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "FUNCTION", m_name->m_qname.str);
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    return TRUE;
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  }

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (check_routine_access(thd, EXECUTE_ACL,
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			   m_sp->m_db.str, m_sp->m_name.str, 0, FALSE))
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    return TRUE;
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#endif
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  return FALSE;
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}
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bool
Item_func_sp::fix_fields(THD *thd, Item **ref)
{
  bool res;
  DBUG_ASSERT(fixed == 0);
  res= Item_func::fix_fields(thd, ref);
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  if (!res && thd->lex->view_prepare_mode)
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  {
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    /*
      Here we check privileges of the stored routine only during view
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      creation, in order to validate the view.  A runtime check is
      perfomed in Item_func_sp::execute(), and this method is not
      called during context analysis.  Notice, that during view
      creation we do not infer into stored routine bodies and do not
      check privileges of its statements, which would probably be a
      good idea especially if the view has SQL SECURITY DEFINER and
      the used stored procedure has SQL SECURITY DEFINER.
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    */
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    res= find_and_check_access(thd);
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    Security_context *save_secutiry_ctx;
    if (!res && !(res= set_routine_security_ctx(thd, m_sp, false,
                                                &save_secutiry_ctx)))
    {
      sp_restore_security_context(thd, save_secutiry_ctx);
    }
#endif /* ! NO_EMBEDDED_ACCESS_CHECKS */
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  }
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  return res;
}