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Merge bk-internal.mysql.com:/home/bk/mysql-4.1

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into mysql.com:/media/sda1/mysql/mysql-4.1-hook


sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/sql_select.cc:
  Auto merged
This commit is contained in:
unknown
2004-10-10 02:39:48 +04:00
parent 34a30eb705 1d48aec228
commit fe0a0347fc
7 changed files with 82 additions and 56 deletions
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66
sql/sql_select.cc
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@ -4171,8 +4171,9 @@ template class List_iterator<Item_func_match>;
*/
static void
change_cond_ref_to_const(I_List<COND_CMP> *save_list,Item *and_father,
Item *cond, Item *field, Item *value)
change_cond_ref_to_const(THD *thd, I_List<COND_CMP> *save_list,
Item *and_father, Item *cond,
Item *field, Item *value)
{
if (cond->type() == Item::COND_ITEM)
{
@ -4181,7 +4182,7 @@ change_cond_ref_to_const(I_List<COND_CMP> *save_list,Item *and_father,
List_iterator<Item> li(*((Item_cond*) cond)->argument_list());
Item *item;
while ((item=li++))
change_cond_ref_to_const(save_list,and_level ? cond : item, item,
change_cond_ref_to_const(thd, save_list,and_level ? cond : item, item,
field, value);
return;
}
@ -4189,8 +4190,9 @@ change_cond_ref_to_const(I_List<COND_CMP> *save_list,Item *and_father,
return; // Not a boolean function
Item_bool_func2 *func= (Item_bool_func2*) cond;
Item *left_item= func->arguments()[0];
Item *right_item= func->arguments()[1];
Item **args= func->arguments();
Item *left_item= args[0];
Item *right_item= args[1];
Item_func::Functype functype= func->functype();
if (right_item->eq(field,0) && left_item != value &&
@ -4201,7 +4203,8 @@ change_cond_ref_to_const(I_List<COND_CMP> *save_list,Item *and_father,
Item *tmp=value->new_item();
if (tmp)
{
func->arguments()[1] = tmp;
thd->register_item_tree_change(args + 1, args[1], &thd->mem_root);
args[1]= tmp;
func->update_used_tables();
if ((functype == Item_func::EQ_FUNC || functype == Item_func::EQUAL_FUNC)
&& and_father != cond && !left_item->const_item())
@ -4222,13 +4225,15 @@ change_cond_ref_to_const(I_List<COND_CMP> *save_list,Item *and_father,
Item *tmp=value->new_item();
if (tmp)
{
func->arguments()[0] = value = tmp;
thd->register_item_tree_change(args, args[0], &thd->mem_root);
args[0]= value= tmp;
func->update_used_tables();
if ((functype == Item_func::EQ_FUNC || functype == Item_func::EQUAL_FUNC)
&& and_father != cond && !right_item->const_item())
{
func->arguments()[0] = func->arguments()[1]; // For easy check
func->arguments()[1] = value;
args[0]= args[1]; // For easy check
thd->register_item_tree_change(args + 1, args[1], &thd->mem_root);
args[1]= value;
cond->marker=1;
COND_CMP *tmp2;
if ((tmp2=new COND_CMP(and_father,func)))
@ -4274,8 +4279,8 @@ static Item *remove_additional_cond(Item* conds)
}
static void
propagate_cond_constants(I_List<COND_CMP> *save_list,COND *and_father,
COND *cond)
propagate_cond_constants(THD *thd, I_List<COND_CMP> *save_list,
COND *and_father, COND *cond)
{
if (cond->type() == Item::COND_ITEM)
{
@ -4286,18 +4291,19 @@ propagate_cond_constants(I_List<COND_CMP> *save_list,COND *and_father,
I_List<COND_CMP> save;
while ((item=li++))
{
propagate_cond_constants(&save,and_level ? cond : item, item);
propagate_cond_constants(thd, &save,and_level ? cond : item, item);
}
if (and_level)
{ // Handle other found items
I_List_iterator<COND_CMP> cond_itr(save);
COND_CMP *cond_cmp;
while ((cond_cmp=cond_itr++))
if (!cond_cmp->cmp_func->arguments()[0]->const_item())
change_cond_ref_to_const(&save,cond_cmp->and_level,
cond_cmp->and_level,
cond_cmp->cmp_func->arguments()[0],
cond_cmp->cmp_func->arguments()[1]);
{
Item **args= cond_cmp->cmp_func->arguments();
if (!args[0]->const_item())
change_cond_ref_to_const(thd, &save,cond_cmp->and_level,
cond_cmp->and_level, args[0], args[1]);
}
}
}
else if (and_father != cond && !cond->marker) // In a AND group
@ -4307,29 +4313,25 @@ propagate_cond_constants(I_List<COND_CMP> *save_list,COND *and_father,
((Item_func*) cond)->functype() == Item_func::EQUAL_FUNC))
{
Item_func_eq *func=(Item_func_eq*) cond;
bool left_const= func->arguments()[0]->const_item();
bool right_const=func->arguments()[1]->const_item();
Item **args= func->arguments();
bool left_const= args[0]->const_item();
bool right_const= args[1]->const_item();
if (!(left_const && right_const) &&
(func->arguments()[0]->result_type() ==
(func->arguments()[1]->result_type())))
args[0]->result_type() == args[1]->result_type())
{
if (right_const)
{
func->arguments()[1]=resolve_const_item(func->arguments()[1],
func->arguments()[0]);
resolve_const_item(thd, &args[1], args[0]);
func->update_used_tables();
change_cond_ref_to_const(save_list,and_father,and_father,
func->arguments()[0],
func->arguments()[1]);
change_cond_ref_to_const(thd, save_list, and_father, and_father,
args[0], args[1]);
}
else if (left_const)
{
func->arguments()[0]=resolve_const_item(func->arguments()[0],
func->arguments()[1]);
resolve_const_item(thd, &args[0], args[1]);
func->update_used_tables();
change_cond_ref_to_const(save_list,and_father,and_father,
func->arguments()[1],
func->arguments()[0]);
change_cond_ref_to_const(thd, save_list, and_father, and_father,
args[1], args[0]);
}
}
}
@ -4346,7 +4348,7 @@ optimize_cond(THD *thd, COND *conds, Item::cond_result *cond_value)
{
DBUG_EXECUTE("where", print_where(conds, "original"););
/* change field = field to field = const for each found field = const */
propagate_cond_constants((I_List<COND_CMP> *) 0, conds, conds);
propagate_cond_constants(thd, (I_List<COND_CMP> *) 0, conds, conds);
/*
Remove all instances of item == item
Remove all and-levels where CONST item != CONST item