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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/nodes/readfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.230 2010/01/02 16:57:46 momjian Exp $
* $PostgreSQL: pgsql/src/backend/nodes/readfuncs.c,v 1.231 2010/02/12 17:33:20 tgl Exp $
*
* NOTES
* Path and Plan nodes do not have any readfuncs support, because we
@ -279,6 +279,8 @@ _readWindowClause(void)
READ_NODE_FIELD(partitionClause);
READ_NODE_FIELD(orderClause);
READ_INT_FIELD(frameOptions);
READ_NODE_FIELD(startOffset);
READ_NODE_FIELD(endOffset);
READ_UINT_FIELD(winref);
READ_BOOL_FIELD(copiedOrder);