From: Tom Lane <tgl@sss.pgh.pa.us>
To: Mariel Cherkassky <mariel.cherkassky@gmail.com>
cc: Andreas Kretschmer <andreas@a-kretschmer.de>,
        pgsql-performance@lists.postgresql.org
Subject: Re: postgresql 10.1 wrong plan in when using partitions bug
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Comments: In-reply-to Mariel Cherkassky <mariel.cherkassky@gmail.com>
	message dated "Sun, 04 Feb 2018 17:06:38 +0200"
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Date: Sun, 04 Feb 2018 10:39:11 -0500
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Mariel Cherkassky <mariel.cherkassky@gmail.com> writes:
> Great, it solved the issue. Seems problematic that the planner do full
> scans on all partitions in the first case isnt it ? Seems like a bug ?

to_date isn't an immutable function (it depends on timezone and possibly
some other GUC settings).  So there's a limited amount that the planner
can do with it.

			regards, tom lane