dea1491ffb
Per complaint from Peter Holzer. It's useful to cover this special case, since for a boolean variable "foo", earlier parts of the planner will have reduced variants like "foo = true" to just "foo", and thus we may fail to recognize the applicability of a partial index with predicate "foo IS NOT NULL". Back-patch to 9.5, but not further; given the lack of previous complaints this doesn't seem like behavior to change in stable branches.
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