From: | "Josh Berkus" <josh(at)agliodbs(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Josh Berkus" <josh(at)agliodbs(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Eh? |
Date: | 2001-08-14 04:50:36 |
Message-ID: | web-101709@davinci.ethosmedia.com |
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Thread: | |
Lists: | pgsql-sql |
Tom,
> > SHould I be concerned about this?
>
> > DEBUG: geqo_main: using edge recombination crossover [ERX]
>
> Nope. See
> http://www.ca.postgresql.org/users-lounge/docs/7.1/postgres/geqo.html
Cool! I love it when I actually get the chance to see some advance
theory applied. And congrats on implementing it!
Of course, we'll see if it really boosts query optimization when there's
a full data population. This view has 3 UNION statements, 11
subselects, 35 JOINS, and calls on 3 custom formatting functions (two of
them many times). A good "destruction test" for the GEQO, hey? The
only thing I'm missing is a couple of LEFT OUTER JOINS and maybe a WHERE
NOT EXISTS.
-Josh
P.S. The purpose of the view is to "flatten" a large chunk of complex
relational data into a comma-delimited text table to be imported into an
accounting program.
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