I wrote:
> I think what is happening is that the patch shut off CREATE
> INDEX's update of not only the table's stats but also the
> index's stats. This seems unhelpful: the index's empty
> stats can never be what's wanted.
I looked at this more closely and realized that it's a simple matter
of having made the tests in the wrong order. The whole stanza
should only apply when dealing with the table, not the index.
I verified that this change fixes the cross-version-upgrade
failure in local testing, and pushed it.
regards, tom lane