Andres Freund <andres@2ndquadrant.com> writes:
>> The attached patch does just that. Its *not* ready yet though, as it
>> will be apparent for everyone who reads it ;)
ISTM this sort of thing ought to be safe enough, though you probably
need to insist both that the pg_type row's xmin be current XID and
that it not be HEAP_UPDATED.
>> To really make that work in a reliable manner we would probably need
>> an rd_createSubid for typcache entries instead of testing xmin as I have
>> done here?
What's more reliable about that? For one thing, cache entries can get
flushed. The relcache goes to some lengths to hang onto rd_createSubid
anyway, but I don't want to put equivalent logic into typcache.
regards, tom lane
