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Add some basic support for window frame clauses to the window-functions

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patch.  This includes the ability to force the frame to cover the whole
partition, and the ability to make the frame end exactly on the current row
rather than its last ORDER BY peer.  Supporting any more of the full SQL
frame-clause syntax will require nontrivial hacking on the window aggregate
code, so it'll have to wait for 8.5 or beyond.
This commit is contained in:
Tom Lane
2008-12-31 00:08:39 +00:00
parent 0fb9be7acf
commit 8e8854daa2
24 changed files with 757 additions and 307 deletions
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5
src/backend/parser/parse_clause.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.182 2008/12/28 18:53:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_clause.c,v 1.183 2008/12/31 00:08:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1554,7 +1554,7 @@ transformWindowDefinitions(ParseState *pstate,
* Per spec, a windowdef that references a previous one copies the
* previous partition clause (and mustn't specify its own). It can
* specify its own ordering clause. but only if the previous one
* had none.
* had none. It always specifies its own framing clause.
*/
if (refwc)
{
@ -1592,6 +1592,7 @@ transformWindowDefinitions(ParseState *pstate,
wc->orderClause = orderClause;
wc->copiedOrder = false;
}
wc->frameOptions = windef->frameOptions;
wc->winref = winref;
result = lappend(result, wc);