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Alvaro Herrera 1beaa654da libpq: Fix sending queries in pipeline aborted state ... When sending queries in pipeline mode, we were careless about leaving the connection in the right state so that PQgetResult would behave correctly; trying to read further results after sending a query after having read a result with an error would sometimes hang. Fix by ensuring internal libpq state is changed properly. All the state changes were being done by the callers of pqAppendCmdQueueEntry(); it would have become too repetitious to have this logic in each of them, so instead put it all in that function and relieve callers of the responsibility. Add a test to verify this case. Without the code fix, this new test hangs sometimes. Also, document that PQisBusy() would return false when no queries are pending result. This is not intuitively obvious, and NULL would be obtained by calling PQgetResult() at that point, which is confusing. Wording by Boris Kolpackov. In passing, fix bogus use of "false" to mean "0", per Ranier Vilela. Backpatch to 14. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reported-by: Boris Kolpackov <boris@codesynthesis.com> Discussion: https://postgr.es/m/boris.20210624103805@codesynthesis.com		5 years ago
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src	libpq: Fix sending queries in pipeline aborted state	5 years ago
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