bd94845e8c
When determining if it is safe to use an expression as a grouping key for partial aggregation, eager aggregation relies on the B-tree equalimage support function to ensure that equality implies image equality. Previously, the code incorrectly passed the default collation of the expression's data type to the equalimage procedure, rather than the expression's actual collation. As a result, if a column used a non-deterministic collation but the base type's default collation was deterministic, eager aggregation would incorrectly assume that the column was safe for byte-level grouping. This could cause rows to be prematurely grouped and subsequently discarded by strict join conditions, resulting in incorrect query results. This patch fixes the issue by passing the expression's actual collation to the equalimage procedure. Author: Richard Guo <guofenglinux@gmail.com> Reviewed-by: Matheus Alcantara <matheusssilv97@gmail.com> Discussion: https://postgr.es/m/CAMbWs48A53PY1Y4zoj7YhxPww9fO1hfnbdntKfA855zpXfVFRA@mail.gmail.com
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/.