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The impact of VARIADIC on the combine/serialize/deserialize support functions of an aggregate wasn't thought through carefully. There is actually no impact, because variadicity isn't passed through to these functions (and it doesn't seem like it would need to be). However, lookup_agg_function was mistakenly told to check things as though it were passed through. The net result was that it was impossible to declare an aggregate that had both VARIADIC input and parallelism support functions. In passing, fix a runtime check in nodeAgg.c for the combine function's strictness to make its error message agree with the creation-time check. The previous message was actually backwards, and it doesn't seem like there's a good reason to have two versions of this message text anyway. Back-patch to 9.6 where parallel aggregation was introduced. Alexey Bashtanov; message fix by me Discussion: https://postgr.es/m/f86dde87-fef4-71eb-0480-62754aaca01b@imap.cc
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/.