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MySQL 5.1: Item_in_optimizer Class Reference

Item_in_optimizer Class Reference

#include <item_cmpfunc.h>

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List of all members.

Public Member Functions

 Item_in_optimizer (Item *a, Item_in_subselect *b)
bool fix_fields (THD *, Item **)
bool fix_left (THD *thd, Item **ref)
bool is_null ()
longlong val_int ()
void cleanup ()
const char * func_name () const
Item_cache ** get_cache ()
void keep_top_level_cache ()

Protected Attributes

Item_cache * cache
bool save_cache

Detailed Description

Definition at line 103 of file item_cmpfunc.h.

Constructor & Destructor Documentation

Item_in_optimizer::Item_in_optimizer ( Item *  a,
Item_in_subselect *  b 
) [inline]

Definition at line 109 of file item_cmpfunc.h.

00109                                                   :
00110     Item_bool_func(a, my_reinterpret_cast(Item *)(b)), cache(0), save_cache(0)
00111   {}
  bool fix_fields(THD *, Item **);

Member Function Documentation

void Item_in_optimizer::cleanup (  )  [virtual]

Reimplemented from Item_result_field.

Definition at line 928 of file item_cmpfunc.cc.

References cache, Item_result_field::cleanup(), DBUG_ENTER, DBUG_VOID_RETURN, and save_cache.

00929 {
00930   DBUG_ENTER("Item_in_optimizer::cleanup");
00931   Item_bool_func::cleanup();
00932   if (!save_cache)
00933     cache= 0;
00934   DBUG_VOID_RETURN;
00935 }

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bool Item_in_optimizer::fix_fields ( THD *  ,
Item **   
) [virtual]

Reimplemented from Item_func.

Definition at line 879 of file item_cmpfunc.cc.

References Item_func::args, subselect_engine::cols(), Item::cols(), Item::const_item(), Item_func::const_item_cache, DBUG_ASSERT, Item_subselect::engine, ER_OPERAND_COLUMNS, FALSE, fix_left(), Item::fixed, Item::maybe_null, my_error(), MYF, Item::not_null_tables(), Item_func::not_null_tables_cache, TRUE, Item::used_tables(), Item_func::used_tables_cache, and Item::with_sum_func.

Referenced by fix_left().

00880 {
00881   DBUG_ASSERT(fixed == 0);
00882   if (fix_left(thd, ref))
00883     return TRUE;
00884   if (args[0]->maybe_null)
00885     maybe_null=1;
00886 
00887   if (!args[1]->fixed && args[1]->fix_fields(thd, args+1))
00888     return TRUE;
00889   Item_in_subselect * sub= (Item_in_subselect *)args[1];
00890   if (args[0]->cols() != sub->engine->cols())
00891   {
00892     my_error(ER_OPERAND_COLUMNS, MYF(0), args[0]->cols());
00893     return TRUE;
00894   }
00895   if (args[1]->maybe_null)
00896     maybe_null=1;
00897   with_sum_func= with_sum_func || args[1]->with_sum_func;
00898   used_tables_cache|= args[1]->used_tables();
00899   not_null_tables_cache|= args[1]->not_null_tables();
00900   const_item_cache&= args[1]->const_item();
00901   fixed= 1;
00902   return FALSE;
00903 }

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bool Item_in_optimizer::fix_left ( THD *  thd,
Item **  ref 
)

Definition at line 846 of file item_cmpfunc.cc.

References Item_func::args, cache, Item::cols(), Item::const_item(), Item_func::const_item_cache, Item::el(), fix_fields(), Item::fixed, Item_cache::get_cache(), n, Item::not_null_tables(), Item_func::not_null_tables_cache, OUTER_REF_TABLE_BIT, Item_int_func::result_type(), Item_cache::set_used_tables(), Item_cache::setup(), Item::used_tables(), Item_func::used_tables(), Item_func::used_tables_cache, and Item::with_sum_func.

Referenced by fix_fields(), Item_in_subselect::row_value_transformer(), and Item_in_subselect::single_value_transformer().

00847 {
00848   if (!args[0]->fixed && args[0]->fix_fields(thd, args) ||
00849       !cache && !(cache= Item_cache::get_cache(args[0]->result_type())))
00850     return 1;
00851 
00852   cache->setup(args[0]);
00853   if (cache->cols() == 1)
00854   {
00855     if ((used_tables_cache= args[0]->used_tables()))
00856       cache->set_used_tables(OUTER_REF_TABLE_BIT);
00857     else
00858       cache->set_used_tables(0);
00859   }
00860   else
00861   {
00862     uint n= cache->cols();
00863     for (uint i= 0; i < n; i++)
00864     {
00865       if (args[0]->el(i)->used_tables())
00866         ((Item_cache *)cache->el(i))->set_used_tables(OUTER_REF_TABLE_BIT);
00867       else
00868         ((Item_cache *)cache->el(i))->set_used_tables(0);
00869     }
00870     used_tables_cache= args[0]->used_tables();
00871   }
00872   not_null_tables_cache= args[0]->not_null_tables();
00873   with_sum_func= args[0]->with_sum_func;
00874   const_item_cache= args[0]->const_item();
00875   return 0;
00876 }

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const char* Item_in_optimizer::func_name (  )  const [inline, virtual]

Implements Item_func.

Definition at line 124 of file item_cmpfunc.h.

00124 { return "<in_optimizer>"; }

Item_cache** Item_in_optimizer::get_cache (  )  [inline]

Definition at line 125 of file item_cmpfunc.h.

References cache.

Referenced by Item_in_subselect::row_value_transformer(), and Item_in_subselect::single_value_transformer().

00125 { return &cache; }

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bool Item_in_optimizer::is_null (  )  [virtual]

Reimplemented from Item_func.

Definition at line 938 of file item_cmpfunc.cc.

References Item_func::args, cache, Item::is_null(), Item::null_value, and Item_cache::store().

00939 {
00940   cache->store(args[0]);
00941   return (null_value= (cache->null_value || args[1]->is_null()));
00942 }

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void Item_in_optimizer::keep_top_level_cache (  ) 

Definition at line 921 of file item_cmpfunc.cc.

References cache, Item_cache::keep_array(), and save_cache.

Referenced by Item_in_subselect::row_value_transformer().

00922 {
00923   cache->keep_array();
00924   save_cache= 1;
00925 }

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longlong Item_in_optimizer::val_int (  )  [virtual]

Implements Item.

Definition at line 906 of file item_cmpfunc.cc.

References Item_func::args, cache, DBUG_ASSERT, Item::fixed, Item::null_value, Item_cache::store(), and Item::val_bool_result().

00907 {
00908   DBUG_ASSERT(fixed == 1);
00909   cache->store(args[0]);
00910   if (cache->null_value)
00911   {
00912     null_value= 1;
00913     return 0;
00914   }
00915   bool tmp= args[1]->val_bool_result();
00916   null_value= args[1]->null_value;
00917   return tmp;
00918 }

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Member Data Documentation

Item_cache* Item_in_optimizer::cache [protected]

Definition at line 106 of file item_cmpfunc.h.

Referenced by cleanup(), fix_left(), get_cache(), is_null(), keep_top_level_cache(), and val_int().

bool Item_in_optimizer::save_cache [protected]

Definition at line 107 of file item_cmpfunc.h.

Referenced by cleanup(), and keep_top_level_cache().

The documentation for this class was generated from the following files:
Generated on Sat Sep 9 21:48:44 2006 for MySQL 5.1 by  doxygen 1.4.7