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Fix inconsistent decisions about NOMATCH vs UNSUPPORTED result codes. If we're going to cater for partkeys that have the same expression and different collations, surely we should also support partkeys with the same expression and different opclasses. Clean up shaky handling of commuted opclauses, eg checking the wrong operator to see what its negator is. This wouldn't cause any actual bugs given a sane opclass definition, but it doesn't seem helpful to expend more code to be less correct. Improve handling of null elements in ScalarArrayOp arrays: in the "op ALL" case, we can conclude they result in an unsatisfiable clause. Minor cosmetic changes and comment improvements.
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/.