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When a Var of the relation to be partially aggregated is known equal to a GROUP BY expression through an EC, get_expression_sortgroupref() let it reuse that expression's SortGroupClause. If the two are of different types, as with an int2 grouping key joined to an int4 column, the Var was then grouped using the other type's equality operator, which could put unequal values into the same group and give wrong results. To fix, accept only EC members of the same type as the grouping expression. A cross-type Var is then treated like any other join key and gets a SortGroupClause built for its own type. Reported-by: Robert Haas <robertmhaas@gmail.com> Author: Richard Guo <guofenglinux@gmail.com> Discussion: https://postgr.es/m/CA+Tgmob7iSM9YkRM44VjUDuaCchW-fY54MV5njpTZTL9uNyV4w@mail.gmail.com Backpatch-through: 19
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/.