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1349d2790added code to allow DISTINCT and ORDER BY aggregates to work more efficiently by using presorted input. That commit added some code that made use of the AggState's tmpcontext and adjusted the ecxt_outertuple and ecxt_innertuple slots before checking if the current row is distinct from the previously seen row. That code forgot to set the TupleTableSlots back to what they were originally, which could result in errors such as: ERROR: attribute 1 of type record has wrong type This only affects aggregate functions which have multiple arguments when DISTINCT is used. For example: string_agg(DISTINCT col, ', ') Thanks to Tom Lane for identifying the breaking commit. Bug: #18264 Reported-by: Vojtěch Beneš Discussion: https://postgr.es/m/18264-e363593d7e9feb7d@postgresql.org Backpatch-through: 16, where1349d2790was added
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.