Re: Bitmapscan changes

Heikki Linnakangas <heikki@enterprisedb.com> writes:
> The patch also adds support for candidate matches. An index scan can
> indicate that the tuples it's returning are candidates, and the executor
> will recheck the original scan quals of any candidate matches when the
> tuple is fetched from heap.

This will not work, unless we change the planner --- the original quals
aren't necessarily there in some corner cases (partial indexes, if
memory serves).

> The motivation for adding the support for candidate matches is that GIT
> / clustered indexes need it.

You need more than a vague reference to an unapplied patch to convince
me we ought to do this.

            regards, tom lane