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Re: Query plan question, and a memory leak - Mailing list pgsql-general

From Tom Lane
Subject Re: Query plan question, and a memory leak
Date
Msg-id 3618.1044249742@sss.pgh.pa.us
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In response to Re: Query plan question, and a memory leak  (Greg Stark <gsstark@mit.edu>)
Responses Re: Query plan question, and a memory leak  (Greg Stark <gsstark@mit.edu>)
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Greg Stark <gsstark@mit.edu> writes:
> However I tested those queries with some data and things really do seem to be
> behaving oddly. It takes nearly twice as long to run the version with the
> where clause and duplicate subplan.

Yes, they will both be executed --- there's no
duplicate-subexpression-elimination logic...

            regards, tom lane

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