f72d9a5e7d
indexing.sql's test for this feature was added along with the feature in commit 2b2727343. However, shortly later that test was rendered ineffective by commit 074251db6, which limited when the optimization would be applied, so that the test didn't test it. Since then, commit dd299df81 added new tests (in btree_index.sql) that actually do test the feature. Code coverage comparisons confirm that this test sequence adds no meaningful coverage, and it's rather expensive, accounting for nearly half of the runtime of indexing.sql according to my measurements. So let's remove it. Per advice from Peter Geoghegan. Discussion: https://postgr.es/m/735.1554935715@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/.