Repeat the condition check twice in function distribute_qual_to_rels
От
bigbro_wq@hotmail.com
Тема
Repeat the condition check twice in function distribute_qual_to_rels
Дата
Msg-id
TYCPR01MB6093C42081BD8EC36E03478F85502@TYCPR01MB6093.jpnprd01.prod.outlook.com
Список
Дерево обсуждения
Repeat the condition check twice in function distribute_qual_to_rels "bigbro_wq@hotmail.com" <bigbro_wq@hotmail.com>
Re: Repeat the condition check twice in function distribute_qual_to_rels Tom Lane <tgl@sss.pgh.pa.us>
Hi,
I notice that check the condtion again when after invoked process_equivalence and return failed.
if (restrictinfo->mergeopfamilies)
{
if (maybe_equivalence)
{
if (process_equivalence(root, &restrictinfo, jtitem->jdomain))
{
/* distribute to base */
int relid;
if (bms_get_singleton_member(restrictinfo->required_relids, &relid))
{
restrictinfo->fromec = true;
distribute_restrictinfo_to_rels(root, restrictinfo);
}
return;
}
/* EC rejected it, so set left_ec/right_ec the hard way ... */
if (restrictinfo->mergeopfamilies) /* EC might have changed this */
initialize_mergeclause_eclasses(root, restrictinfo);
/* ... and fall through to distribute_restrictinfo_to_rels */
}
-----------------------------------------------------------------------------------
Above the codes, check the condition again when invoked process_equivalence failed,
but it's already under the positive condition "if (restrictinfo->mergeopfamilies)".
It's necessary ?
bigbro_wq@hotmail.com
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