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0be39b4b1a
Because we failed to do this, DISTINCT in GROUP BY DISTINCT would be ignored in PL/pgSQL assignment statements. It's not surprising that no one noticed, since such statements will throw an error if the query produces more than one row. That eliminates most scenarios where advanced forms of GROUP BY could be useful, and indeed makes it hard even to find a simple test case. Nonetheless it's wrong. This is directly the fault ofbe45be9c3which added the groupDistinct field, but I think much of the blame has to fall onc9d529848, in which I incautiously supposed that we'd manage to keep two copies of a big chunk of parse-analysis logic in sync. As a follow-up, I plan to refactor so that there's only one copy. But that seems useful only in master, so let's use this one-line fix for the back branches. Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/31027.1758919078@sss.pgh.pa.us Backpatch-through: 14
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/.