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When strict aggregate combine functions, used in multi-stage/parallel aggregation, returned NULL, we didn't check for that, invoking the combine function with NULL the next round, despite it being strict. The equivalent code invoking normal transition functions has a check for that situation, which did not get copied in a7de3dc5c346. Fix the bug by adding the equivalent check. Based on a quick look I could not find any strict combine functions in core actually returning NULL, and it doesn't seem very likely external users have done so. So this isn't likely to have caused issues in practice. Add tests verifying transition / combine functions returning NULL is tested. Reported-By: Andres Freund Author: Andres Freund Discussion: https://postgr.es/m/20171121033642.7xvmjqrl4jdaaat3@alap3.anarazel.de Backpatch: 9.6, where parallel aggregation was introduced
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/.