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Support window functions a la SQL:2008.

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Hitoshi Harada, with some kibitzing from Heikki and Tom.
This commit is contained in:
Tom Lane
2008-12-28 18:54:01 +00:00
parent 38e9348282
commit 95b07bc7f5
92 changed files with 6720 additions and 321 deletions
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10
src/backend/optimizer/path/equivclass.c
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/equivclass.c,v 1.14 2008/12/01 21:06:13 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/equivclass.c,v 1.15 2008/12/28 18:53:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -438,14 +438,16 @@ get_eclass_for_sort_expr(PlannerInfo *root,
/*
* add_eq_member doesn't check for volatile functions, set-returning
* functions, or aggregates, but such could appear in sort expressions; so
* we have to check whether its const-marking was correct.
* functions, aggregates, or window functions, but such could appear
* in sort expressions; so we have to check whether its const-marking
* was correct.
*/
if (newec->ec_has_const)
{
if (newec->ec_has_volatile ||
expression_returns_set((Node *) expr) ||
contain_agg_clause((Node *) expr))
contain_agg_clause((Node *) expr) ||
contain_window_function((Node *) expr))
{
newec->ec_has_const = false;
newem->em_is_const = false;