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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/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.270 2010/01/02 16:57:47 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.271 2010/02/12 17:33:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3364,7 +3364,8 @@ make_windowagg(PlannerInfo *root, List *tlist,
int numWindowFuncs, Index winref,
int partNumCols, AttrNumber *partColIdx, Oid *partOperators,
int ordNumCols, AttrNumber *ordColIdx, Oid *ordOperators,
int frameOptions, Plan *lefttree)
int frameOptions, Node *startOffset, Node *endOffset,
Plan *lefttree)
{
WindowAgg *node = makeNode(WindowAgg);
Plan *plan = &node->plan;
@ -3379,6 +3380,8 @@ make_windowagg(PlannerInfo *root, List *tlist,
node->ordColIdx = ordColIdx;
node->ordOperators = ordOperators;
node->frameOptions = frameOptions;
node->startOffset = startOffset;
node->endOffset = endOffset;
copy_plan_costsize(plan, lefttree); /* only care about copying size */
cost_windowagg(&windowagg_path, root,