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text_pattern_ops and its siblings can't be used with nondeterministic collations, because they use the text_eq operator which will not behave as bitwise equality if applied with a nondeterministic collation. The initial implementation of that restriction was to insert a run-time test in the related comparison functions, but that is inefficient, may throw misleading errors, and will throw errors in some cases that would work. It seems sufficient to just prevent the combination during CREATE INDEX, so do that instead. Lacking any better way to identify the opclasses involved, we need to hard-wire tests for them, which requires hand-assigned values for their OIDs, which forces a catversion bump because they previously had OIDs that would be assigned automatically. That's slightly annoying in the v12 branch, but fortunately we're not at rc1 yet, so just do it. Back-patch to v12 where nondeterministic collations were added. In passing, run make reformat-dat-files, which found some unrelated whitespace issues (slightly different ones in HEAD and v12). Peter Eisentraut, with small corrections by me Discussion: https://postgr.es/m/22566.1568675619@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/.