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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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16
src/backend/optimizer/plan/subselect.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.143 2008/12/08 00:16:09 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.144 2008/12/28 18:53:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1243,6 +1243,7 @@ simplify_EXISTS_query(Query *query)
query->intoClause ||
query->setOperations ||
query->hasAggs ||
query->hasWindowFuncs ||
query->havingQual ||
query->limitOffset ||
query->limitCount ||
@ -1258,13 +1259,14 @@ simplify_EXISTS_query(Query *query)
/*
* Otherwise, we can throw away the targetlist, as well as any GROUP,
* DISTINCT, and ORDER BY clauses; none of those clauses will change
* a nonzero-rows result to zero rows or vice versa. (Furthermore,
* WINDOW, DISTINCT, and ORDER BY clauses; none of those clauses will
* change a nonzero-rows result to zero rows or vice versa. (Furthermore,
* since our parsetree representation of these clauses depends on the
* targetlist, we'd better throw them away if we drop the targetlist.)
*/
query->targetList = NIL;
query->groupClause = NIL;
query->windowClause = NIL;
query->distinctClause = NIL;
query->sortClause = NIL;
query->hasDistinctOn = false;
@ -1321,8 +1323,8 @@ convert_EXISTS_to_ANY(PlannerInfo *root, Query *subselect,
* The rest of the sub-select must not refer to any Vars of the parent
* query. (Vars of higher levels should be okay, though.)
*
* Note: we need not check for Aggs separately because we know the
* sub-select is as yet unoptimized; any uplevel Agg must therefore
* Note: we need not check for Aggrefs separately because we know the
* sub-select is as yet unoptimized; any uplevel Aggref must therefore
* contain an uplevel Var reference. This is not the case below ...
*/
if (contain_vars_of_level((Node *) subselect, 1))
@ -1432,7 +1434,8 @@ convert_EXISTS_to_ANY(PlannerInfo *root, Query *subselect,
/*
* And there can't be any child Vars in the stuff we intend to pull up.
* (Note: we'd need to check for child Aggs too, except we know the
* child has no aggs at all because of simplify_EXISTS_query's check.)
* child has no aggs at all because of simplify_EXISTS_query's check.
* The same goes for window functions.)
*/
if (contain_vars_of_level((Node *) leftargs, 0))
return NULL;
@ -1955,6 +1958,7 @@ finalize_plan(PlannerInfo *root, Plan *plan, Bitmapset *valid_params)
case T_RecursiveUnion:
case T_Hash:
case T_Agg:
case T_WindowAgg:
case T_SeqScan:
case T_Material:
case T_Sort: