Re: [HACKERS] Re: subquery performance and EXISTS

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgreSQL(dot)org>
Subject: Re: [HACKERS] Re: subquery performance and EXISTS
Date: 1999-12-29 22:25:47
Message-ID: 5065.946506347@sss.pgh.pa.us
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Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> How hard would it be to have the EXISTS be done automatically? The
> performance problem for subqueries has bothered me for two years now.

I think the ideal solution would involve rewriting the subquery into
a single-level query. I haven't looked at how hard this would be...

regards, tom lane

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