Re: crash in plancache with subtransactions

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jim Nasby <Jim@Nasby.net>
Cc: Alvaro Herrera <alvherre@commandprompt.com>, Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2010-11-01T16:25:08Z
Lists: pgsql-hackers
Jim Nasby <Jim@Nasby.net> writes:
> (looking at original case)... the original bug wasn't actually
> recursive.

No, there are two different cases being dealt with here.  If the first
call of an expression results in an error, and then we come back and try
to re-use the expression state tree, we can have trouble because the
state tree contains partially-updated internal state for the called
function.  This doesn't require any recursion but it leads to pretty
much the same problems as the recursive case.

			regards, tom lane