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This new field tracks the PID of the group leader used with parallel query. For parallel workers and the leader, the value is set to the PID of the group leader. So, for the group leader, the value is the same as its own PID. Note that this reflects what PGPROC stores in shared memory, so as leader_pid is NULL if a backend has never been involved in parallel query. If the backend is using parallel query or has used it at least once, the value is set until the backend exits. Author: Julien Rouhaud Reviewed-by: Sergei Kornilov, Guillaume Lelarge, Michael Paquier, Tomas Vondra Discussion: https://postgr.es/m/CAOBaU_Yy5bt0vTPZ2_LUM6cUcGeqmYNoJ8-Rgto+c2+w3defYA@mail.gmail.com
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