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The code added by commit c203d6cf8 causes a crash in at least one case, where a potentially-optimizable expression index has a storage type different from the input data type. A cursory code review turned up numerous other problems that seem impractical to fix on short notice. Andres argued for revert of that patch some time ago, and if additional senior committers had been paying attention, that's likely what would have happened, but we were not :-( At this point we can't just revert, at least not in v11, because that would mean an ABI break for code touching relcache entries. And we should not remove the (also buggy) support for the recheck_on_update index reloption, since it might already be used in some databases in the field. So this patch just does the as-little-invasive-as-possible measure of disabling the feature as though recheck_on_update were forced off for all indexes. I also removed the related regression tests (which would otherwise fail) and the user-facing documentation of the reloption. We should undertake a more thorough code cleanup if the patch can't be fixed, but not under the extreme time pressure of being already overdue for 11.1 release. Per report from Ondřej Bouda and subsequent private discussion among pgsql-release. Discussion: https://postgr.es/m/20181106185255.776mstcyehnc63ty@alvherre.pgsql
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/.