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3 commits

Author SHA1 Message Date
Tom Lane
8e8854daa2 Add some basic support for window frame clauses to the window-functions 
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.
 2008-12-31 00:08:39 +00:00
Tom Lane
2f806e540f Tighten up a couple of regression test cases that can have platform-dependent 
results due to underspecified ordering.  Per report from buildfarm member
pika.
 2008-12-29 02:58:11 +00:00
Tom Lane
95b07bc7f5 Support window functions a la SQL:2008. 
Hitoshi Harada, with some kibitzing from Heikki and Tom.
 2008-12-28 18:54:01 +00:00