Re: Collation versioning

On Wed, Nov 27, 2019 at 04:09:57PM -0500, Robert Haas wrote:
> Yeah, I like #3 too. If we're going to the trouble to build all of
> this mechanism, it seems worth it to build the additional machinery to
> be precise about the difference between "looks like a problem" and "we
> don't know".

Indeed, #3 sounds like a sensible way of doing things.  The two others
may cause random problems which are harder to actually detect and act
on as we should avoid as much as possible a forced system-wide REINDEX
after an upgrade to a post-13 PG.
--
Michael