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Fixed problem with ISNULL on fields that could not be null

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unknown 2003-02-17 01:05:04 +02:00
parent cad553de49
commit 1f66df4d47
1 changed files with 10 additions and 8 deletions
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18
sql/item_cmpfunc.h
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@ -449,17 +449,19 @@ public:
void update_used_tables()
{
if (!args[0]->maybe_null)
used_tables_cache=0; /* is always false */
{
used_tables_cache= 0; /* is always false */
cached_value= (longlong) 0;
}
else
{
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;
if (!(used_tables_cache=args[0]->used_tables()))
{
/* 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; }