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List: postgresql-general
Subject: Re: [HACKERS] EXPLAIN Node Docs?
From: "David E. Wheeler" <david () kineticode ! com>
Date: 2011-04-29 23:28:09
Message-ID: A4360496-002D-4D3E-B62C-29160EC3F2AD () kineticode ! com
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On Apr 29, 2011, at 2:07 PM, Tom Lane wrote:
> In particular, src/include/nodes/plannodes.h is pretty well commented.
Ah, that's a useful file to scan, thanks.
> If it's not immediately obvious how that maps to what's shown by
> EXPLAIN, look into commands/explain.c.
Yeah, that's the file I have been reading.
> (There are things that aren't
> mentioned by EXPLAIN even in verbose mode, such as which columns Group
> is going to group by; usually that's because it's redundant with info
> available elsewhere, such as the sort columns of a lower sort node.)
Right, I figured that one out. Same does not appear to be true of Filter elements, \
though.
> Keep in mind also that we reserve the right to whack these things around
> in arbitrary ways from one release to the next.
Yeah, though I assume you mean major releases, not maintenance releases. Still, it'd \
be nice to have a documentation reference.
Best,
David
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