Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
>> (Note to self: we can't remove the cast_hash_context field in
>> back branches for fear of causing an ABI break for pldebugger.
>> But we can leave it unused, I think.)
> Hmm, we can leave it unused in our code, but it still needs to be
> initialized to some valid memory context anyway; otherwise hypothetical
> code that uses it would still crash.
I think we want that to happen, actually, because it's impossible
to guess what such hypothetical code needs the context to be.
As things stand now, that field points to a long-lived context
in some cases and a short-lived one in others. We risk either
data structure corruption or a session-lifespan memory leak
if we guess about such usage ... which really shouldn't exist
anyway.
regards, tom lane
