Robert Haas <> writes:
> ... Assuming that we can
> convince ourselves that that much is OK, I don't see why using a
> syscache callback to help ensure that the mappings are blown away in
> an at-least-somewhat-timely fashion is worse than any other approach.

I think the point you've not addressed is that "syscache callback
occurred" does not equate to "object was dropped".  Can the code
survive having this occur at any invalidation point?
(CLOBBER_CACHE_ALWAYS testing would soon expose any fallacy there.)

                        regards, tom lane

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