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The planner's optimization code for LIKE and regex operators could error out with a complaint like "no = operator for opfamily NNN" if someone created a binary-compatible index (for example, a bpchar_ops index on a text column) on the LIKE's left argument. This is a consequence of careless refactoring in commit 74dfe58a5. The old code in match_special_index_operator only accepted specific combinations of the pattern operator and the index opclass, thereby indirectly guaranteeing that the opclass would have a comparison operator with the same LHS input type as the pattern operator. While moving the logic out to a planner support function, I simplified that test in a way that no longer guarantees that. Really though we'd like an altogether weaker dependency on the opclass, so rather than put back exactly the old code, just allow lookup failure. I have in mind now to rewrite this logic completely, but this is the minimum change needed to fix the bug in v12. Per report from Manuel Rigger. Back-patch to v12 where the mistake came in. Discussion: https://postgr.es/m/CA+u7OA7nnGYy8rY0vdTe811NuA+Frr9nbcBO9u2Z+JxqNaud+g@mail.gmail.com
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/.