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
