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The following routines are added to libpq: PGresult *PQclosePrepared(PGconn *conn, const char *stmt); PGresult *PQclosePortal(PGconn *conn, const char *portal); int PQsendClosePrepared(PGconn *conn, const char *stmt); int PQsendClosePortal(PGconn *conn, const char *portal); The "send" routines are non-blocking versions of the two others. Close messages are part of the protocol but they did not have a libpq implementation. And, having these routines is for instance useful with connection poolers as these can detect more easily Close messages than DEALLOCATE queries. The implementation takes advantage of what the Describe routines rely on for portals and statements. Some regression tests are added in libpq_pipeline, for the four new routines, by closing portals and statements created already by the tests. Author: Jelte Fennema Reviewed-by: Jian He, Michael Paquier Discussion: https://postgr.es/m/CAGECzQTb4xFAopAVokudB+L62Kt44mNAL4Z9zZ7UTrs1TRFvWA@mail.gmail.com