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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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4
src/backend/executor/nodeAgg.c
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@ -71,7 +71,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeAgg.c,v 1.172 2010/02/08 20:39:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeAgg.c,v 1.173 2010/02/12 17:33:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1999,7 +1999,7 @@ AggCheckCallContext(FunctionCallInfo fcinfo, MemoryContext *aggcontext)
if (fcinfo->context && IsA(fcinfo->context, WindowAggState))
{
if (aggcontext)
*aggcontext = ((WindowAggState *) fcinfo->context)->wincontext;
*aggcontext = ((WindowAggState *) fcinfo->context)->aggcontext;
return AGG_CONTEXT_WINDOW;
}