Optimize BooleanTest with non-nullable input The BooleanTest construct (IS [NOT] TRUE/FALSE/UNKNOWN) treats a NULL input as the logical value "unknown". However, when the input is proven to be non-nullable, this special handling becomes redundant. In such cases, the construct can be simplified directly to a boolean expression or a constant.
Author: Richard Guo <[email protected]> Reviewed-by: Tender Wang <[email protected]> Discussion: https://postgr.es/m/cambws49bmaowvkdshxpudnniqjcecgq3_8dd_5wtr4xrqy8...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/0aaf0de7fed8555114aca766e9cdc836dad763a3 Modified Files -------------- src/backend/optimizer/util/clauses.c | 31 +++++++++ src/test/regress/expected/predicate.out | 119 ++++++++++++++++++++++++++++++++ src/test/regress/sql/predicate.sql | 54 +++++++++++++++ 3 files changed, 204 insertions(+)
