On 7/26/18, 10:07 AM, "Bossart, Nathan" <bossartn@amazon.com> wrote:
> The first time we use this callback, the relation won't be locked, so
> isn't it possible that we won't get a valid tuple here? I did notice
> that callbacks like RangeVarCallbackForRenameRule,
> RangeVarCallbackForPolicy, and RangeVarCallbackForRenameTrigger assume
> that the relation can be concurrently dropped, but
> RangeVarCallbackOwnsRelation does not. Instead, we assume that the
> syscache search will succeed if the given OID is valid. Is this a
> bug, or am I missing something?
Please pardon the noise. I see that we don't accept invalidation
messages until later on in RangeVarGetRelidExtended(), at which point
we'll retry and get InvalidOid for concurrently dropped relations.
Nathan