Teach predtest.c that "foo" implies "foo IS NOT NULL".
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.
Branch
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master
Details
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http://git.postgresql.org/pg/commitdiff/dea1491ffb448d20764a5f2cec8ae33b64dd39f8
Modified Files
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src/backend/optimizer/util/predtest.c | 4 ++++
1 file changed, 4 insertions(+)