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merge with 3.23.51

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monty@hundin.mysql.fi
2002-05-16 18:20:49 +03:00
parent 4ca4f4788b f092818715
commit f5ed8784a2
769 changed files with 673 additions and 86016 deletions
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7
sql/item_cmpfunc.h
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@ -430,6 +430,7 @@ class Item_func_in :public Item_int_func
class Item_func_isnull :public Item_bool_func
{
longlong cached_value;
public:
Item_func_isnull(Item *a) :Item_bool_func(a) {}
longlong val_int();
@ -450,6 +451,12 @@ public:
args[0]->update_used_tables();
used_tables_cache=args[0]->used_tables();
}
if (!used_tables_cache)
{
/* Remember if the value is always NULL or never NULL */
args[0]->val();
cached_value= args[0]->null_value ? (longlong) 1 : (longlong) 0;
}
}
optimize_type select_optimize() const { return OPTIMIZE_NULL; }
};