Andres Freund <andres@2ndquadrant.com> writes:
> Those columns cannot be NULL, so using IS DISTINCT FROM seems a bit
> clumsy.
That was what I started to write, too, but actually I think the IS
DISTINCT is correct and the RIGHT JOIN should be a LEFT JOIN. Note
that the query appears to be intended to collect regular tables as
well as indexes. (As patched, that's totally broken, so I infer
Bruce hasn't tested it yet.)
regards, tom lane