[prev in list] [next in list] [prev in thread] [next in thread] 

List:       pgsql-hackers
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
[Download RAW message or body]

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


-- 
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers


[prev in list] [next in list] [prev in thread] [next in thread]