I wrote: > This is not a fundamental shortcoming in the system, it's just > that optimizer/util/predtest.c has not been built out very far > with respect to BooleanTest nodes.
Oh ... I'd momentarily forgotten that there's already a patch in the queue to attack that: https://commitfest.postgresql.org/51/4690/ That's been stalled for lack of review, so if you were interested in helping out, that'd be great. regards, tom lane
