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Extend the set of frame options supported for window functions.

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This patch allows the frame to start from CURRENT ROW (in either RANGE or
ROWS mode), and it also adds support for ROWS n PRECEDING and ROWS n FOLLOWING
start and end points.  (RANGE value PRECEDING/FOLLOWING isn't there yet ---
the grammar works, but that's all.)

Hitoshi Harada, reviewed by Pavel Stehule
This commit is contained in:
Tom Lane
2010-02-12 17:33:21 +00:00
parent a5348fafd1
commit ec4be2ee68
28 changed files with 1237 additions and 254 deletions
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20
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.157 2010/01/15 22:36:32 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.158 2010/02/12 17:33:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -466,10 +466,26 @@ set_plan_refs(PlannerGlobal *glob, Plan *plan, int rtoffset)
}
break;
case T_Agg:
case T_WindowAgg:
case T_Group:
set_upper_references(glob, plan, rtoffset);
break;
case T_WindowAgg:
{
WindowAgg *wplan = (WindowAgg *) plan;
set_upper_references(glob, plan, rtoffset);
/*
* Like Limit node limit/offset expressions, WindowAgg has
* frame offset expressions, which cannot contain subplan
* variable refs, so fix_scan_expr works for them.
*/
wplan->startOffset =
fix_scan_expr(glob, wplan->startOffset, rtoffset);
wplan->endOffset =
fix_scan_expr(glob, wplan->endOffset, rtoffset);
}
break;
case T_Result:
{
Result *splan = (Result *) plan;