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Commit fc7695891 changed CheckAttributeType to recurse into ranges, but made it pass down the wrong collation (always InvalidOid, since ranges as such have no collation). This would result in guaranteed failure when considering a range type whose subtype is collatable. Embarrassingly, we lack any regression tests that would expose such a problem (but fortunately, somebody noticed before we shipped this bug in any release). Fix it to pass down the range's subtype collation property instead, and add some regression test cases to exercise collatable-subtype ranges a bit more. Back-patch to all supported branches, as the previous patch was. Report and patch by Julien Rouhaud, test cases tweaked by me Discussion: https://postgr.es/m/CAOBaU_aBWqNweiGUFX0guzBKkcfJ8mnnyyGC_KBQmO12Mj5f_A@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/.