| 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: | 14056.1304111227@sss.pgh.pa.us |
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| 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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