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e6a9637488
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.
Documentation concerning how to run these regression tests and interpret the results can be found in the PostgreSQL manual, in the chapter "Regression Tests".