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indexing.sql's test for this feature was added along with the feature in commit2b2727343. However, shortly later that test was rendered ineffective by commit074251db6, which limited when the optimization would be applied, so that the test didn't test it. Since then, commitdd299df81added 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 tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure