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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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7
src/backend/parser/parse_agg.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_agg.c,v 1.90 2010/01/02 16:57:49 momjian Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_agg.c,v 1.91 2010/02/12 17:33:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -258,7 +258,9 @@ transformWindowFuncCall(ParseState *pstate, WindowFunc *wfunc,
continue;
if (equal(refwin->partitionClause, windef->partitionClause) &&
equal(refwin->orderClause, windef->orderClause) &&
refwin->frameOptions == windef->frameOptions)
refwin->frameOptions == windef->frameOptions &&
equal(refwin->startOffset, windef->startOffset) &&
equal(refwin->endOffset, windef->endOffset))
{
/* found a duplicate window specification */
wfunc->winref = winref;
@ -505,6 +507,7 @@ parseCheckWindowFuncs(ParseState *pstate, Query *qry)
parser_errposition(pstate,
locate_windowfunc(expr))));
}
/* startOffset and limitOffset were checked in transformFrameOffset */
}
}