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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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10
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 1.158 2010/01/18 18:17:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/subselect.c,v 1.159 2010/02/12 17:33:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2098,9 +2098,15 @@ finalize_plan(PlannerInfo *root, Plan *plan, Bitmapset *valid_params,
locally_added_param);
break;
case T_WindowAgg:
finalize_primnode(((WindowAgg *) plan)->startOffset,
&context);
finalize_primnode(((WindowAgg *) plan)->endOffset,
&context);
break;
case T_Hash:
case T_Agg:
case T_WindowAgg:
case T_Material:
case T_Sort:
case T_Unique: