763d563eae
When reduce_outer_joins reduces an outer join to an antijoin, any IS NULL qual on a Var from the antijoin's nullable side is necessarily true. Previously, such quals were discarded later in distribute_qual_to_rels, mainly to avoid bogus selectivity estimates. But that discard was incomplete: the qual remained in the jointree, while its Vars were not counted in attr_needed. Since commit2ebf25e7d, join removal edits the jointree and expects it to contain no other references to a removed rel, so it could remove a rel that such a discarded qual still references, and then trip an assertion on the qual's stale Var. To fix, move this processing to an earlier phase: such quals are now removed from the jointree by reduce_outer_joins itself. This way later phases see a consistent query tree, and check_redundant_nullability_qual is no longer needed, so remove it. Back-patch to v16, as with commit2ebf25e7d. Reported-by: Tender Wang <tndrwang@gmail.com> Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAHewXNk8b0TsSy4dL=CO7FXL2W3WBm0BcdP-zwNJePa-Qj4HzA@mail.gmail.com Backpatch-through: 16
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.