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Teach planner how to propagate pathkeys from sub-SELECTs in FROM up to

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the outer query.  (The implementation is a bit klugy, but it would take
nontrivial restructuring to make it nicer, which this is probably not
worth.)  This avoids unnecessary sort steps in examples like
SELECT foo,count(*) FROM (SELECT ... ORDER BY foo,bar) sub GROUP BY foo
which means there is now a reasonable technique for controlling the
order of inputs to custom aggregates, even in the grouping case.
This commit is contained in:
Tom Lane
2003-02-15 20:12:41 +00:00
parent 50c4190e37
commit 056467ec6b
9 changed files with 172 additions and 29 deletions
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6
src/backend/optimizer/util/relnode.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.47 2003/02/08 20:20:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/relnode.c,v 1.48 2003/02/15 20:12:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -381,11 +381,11 @@ new_join_tlist(List *tlist,
foreach(i, tlist)
{
TargetEntry *xtl = lfirst(i);
TargetEntry *tle = lfirst(i);
resdomno += 1;
t_list = lappend(t_list,
create_tl_element(get_expr(xtl), resdomno));
create_tl_element((Var *) tle->expr, resdomno));
}
return t_list;