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This reverts commit f5f30c22ed69fb37b896c4d4546b2ab823c3fd61. Some buildfarm animals are failing with "cannot change "client_encoding" during a parallel operation". It looks like assign_client_encoding is unhappy at being asked to roll back a client_encoding setting after a parallel worker encounters a failure. There must be more to it though: why didn't I see this during local testing? In any case, it's clear that moving the RestoreGUCState() call is not as side-effect-free as I thought. Given that the bug f5f30c22e intended to fix has gone unreported for years, it's not something that's urgent to fix; I'm not willing to risk messing with it further with only days to our next release wrap.
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 (but see also below) examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level kerberos/ Tests for Kerberos/GSSAPI authentication and encryption ldap/ Tests for LDAP-based authentication 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