Horton

Optimize BooleanTest with non-nullable input

Richard Guo <rguo@postgresql.org>

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Commit: 0aaf0de7fed8555114aca766e9cdc836dad763a3
Author: Richard Guo <rguo@postgresql.org>
Date: 2026-02-10T01:18:47Z
Releases: 19 (unreleased) 
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 <guofenglinux@gmail.com>
Reviewed-by: Tender Wang <tndrwang@gmail.com>
Discussion: https://postgr.es/m/CAMbWs49BMAOWvkdSHxpUDnniqJcEcGq3_8dd_5wTR4xrQY8urA@mail.gmail.com

Files

PathChange+/−
src/backend/optimizer/util/clauses.c modified +31 −0
src/test/regress/expected/predicate.out modified +119 −0
src/test/regress/sql/predicate.sql modified +54 −0

Discussion