e6c178b5b7
pg_proc.c and pg_aggregate.c had near-duplicate copies of the logic to decide whether a function or aggregate's signature is legal. This seems like a bad thing even without the problem that the upcoming "anycompatible" patch would roughly double the complexity of that logic. Hence, refactor so that the rules are localized in new subroutines supplied by parse_coerce.c. (One could quibble about just where to add that code, but putting it beside enforce_generic_type_consistency seems not totally unreasonable.) The fact that the rules are about to change would mandate some changes in the wording of the associated error messages in any case. I ended up spelling things out in a fairly literal fashion in the errdetail messages, eg "A result of type anyelement requires at least one input of type anyelement, anyarray, anynonarray, anyenum, or anyrange." Perhaps this is overkill, but once there's more than one subgroup of polymorphic types, people might get confused by more-abstract messages. Discussion: https://postgr.es/m/24137.1584139352@sss.pgh.pa.us
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/.