| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Michael Meskes <meskes(at)postgresql(dot)org>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Re: Does PostgreSQL support EXISTS? |
| Date: | 2001-06-13 15:53:35 |
| Message-ID: | 200106131553.f5DFrZs11003@candle.pha.pa.us |
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| Lists: | pgsql-general |
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > Are we anywhere with optimizing IN to EXISTS? I didn't think there was
> > any work being done in that area.
>
> I don't think it's that hard to do within the outer-join mechanism,
> except for this little issue about NULLs. The planner already makes
> querytree alterations of comparable complexity, to deal with views and
> subselects...
Doing that would elimate the need for query sources, at least for a
while.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
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