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Re: Windowing Function Patch Review -> Standard Conformance

From: "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Windowing Function Patch Review -> Standard Conformance
Date: 2008-12-28 07:22:28
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Lists: pgsql-hackers
2008/12/28 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> I've spent quite a bit of time reviewing the window functions patch,
> and I think it is now ready to commit, other than the documentation
> (which I've not looked at yet at all).  Attached is my current patch
> against HEAD, sans documentation.  This incorporates the recently
> discussed aggregate-function API changes and support for tuplestore
> trimming.  There's a number of things that could be improved yet:
>        * we really ought to have some support for non-built-in
>          window functions
>        * I think the planner could be a bit smarter about when to
>          sort or not
>        * tuplestore_advance and related code really needs to be made
>          more efficient; it didn't matter much before but it does now
> but I think these things can be worked on after the core patch is
> committed.

I ran the patch witouht any errors. Though it's trivial, I noticed
window_gettupleslot has to be fixed a bit.

diff src/backend/executor/nodeWindowAgg.c.orig
>       /* pos = -1 means special on spool_tuples(), so check it before */
>       if (pos < 0)
>               return false;
<       if (pos >= winstate->spooled_rows || pos < 0)
>       if (pos >= winstate->spooled_rows)


Hitoshi Harada

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