"David E. Wheeler" <david@kineticode.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