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Re: EXPLAIN Node Docs?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "David E(dot) Wheeler" <david(at)kineticode(dot)com>
Cc: "pgsql-hackers(at)postgresql(dot)org Hackers" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: EXPLAIN Node Docs?
Date: 2011-04-29 21:07:07
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
"David E. Wheeler" <david(at)kineticode(dot)com> writes:
> Is there any place where the contents of EXPLAIN nodes are documented?

Use the source, Luke ...

In particular, src/include/nodes/plannodes.h is pretty well commented.
If it's not immediately obvious how that maps to what's shown by
EXPLAIN, look into commands/explain.c.  (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.)

Keep in mind also that we reserve the right to whack these things around
in arbitrary ways from one release to the next.

			regards, tom lane

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