ee2fa291c8
The check for window functions (point 4) guarded on the wrong bit: it tested UNSAFE_NOTIN_DISTINCTON_CLAUSE while setting UNSAFE_NOTIN_PARTITIONBY_CLAUSE. Each check in this loop guards on the same bit it is about to set, as an idempotency optimization, since unsafeFlags[] is accumulated across the arms of a set operation and there is no point recomputing a column's status once its bit is present. This is not a live bug. When UNSAFE_NOTIN_PARTITIONBY_CLAUSE is already set but UNSAFE_NOTIN_DISTINCTON_CLAUSE is not, the guard fails to skip targetIsInAllPartitionLists() and recomputes it, but setting the same bit again changes nothing. When UNSAFE_NOTIN_DISTINCTON_CLAUSE is already set, point 4 is skipped and UNSAFE_NOTIN_PARTITIONBY_CLAUSE is left unset; but such a column is already unsafe for pushdown via UNSAFE_NOTIN_DISTINCTON_CLAUSE, so the outcome is unchanged. To fix, test UNSAFE_NOTIN_PARTITIONBY_CLAUSE, matching the bit being set and the pattern of the surrounding checks. Back-patch to v15, where the buggy check was introduced. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Tender Wang <tndrwang@gmail.com> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/CAMbWs49Q_xnF_P2QSUyDzJ34MnrO7dh-cUAaK2HJPgSgh88NcA@mail.gmail.com Backpatch-through: 15 |
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| configure | ||
| configure.ac | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
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| README.md | ||
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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.