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Commit f0c7b789a added a test case in case.sql that creates and then drops both an '=' operator and the type it's for. Given the right timing, that can cause a "cache lookup failed for type" failure in concurrent sessions, which see the '=' operator as a potential match for '=' in a query, but then the type is gone by the time they inquire into its properties. It might be nice to make that behavior more robust someday, but as a back-patchable solution, adjust the new test case so that the operator is never visible to other sessions. Like the previous commit, back-patch to all supported branches. Discussion: <5983.1471371667@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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.