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Commit 449ab63505 added postgres_fdw.application_name GUC that specifies a value for application_name configuration parameter used when postgres_fdw establishes a connection to a foreign server. Also commit 6e0cb3dec1 allowed it to include escape sequences. Both commits added the regression tests for the GUC, but those tests were reverted by commits 98dbef90eb and 5e64ad3697 because they were unstable and caused some buildfarm members to report the failure. This is the third try to add the regression test for postgres_fdw.application_name GUC. One of issues to make the test unstable was to have used postgres_fdw_disconnect_all() to close the existing remote connections. The test expected that the remote connection and its corresponding backend at the remote server disappeared just after postgres_fdw_disconnect_all() was executed, but it could take a bit time for them to disappear. To make sure that they exit, this commit makes the test use pg_terminate_backend() with the timeout at the remote server, instead. If the timeout is set to greater than zero, this function waits until they are actually terminated (or until the given time has passed). Another issue was that the test didn't take into consideration the case where postgres_fdw.application_name containing some escape sequences was converted to the string larger than NAMEDATALEN. In this case it was truncated to less than NAMEDATALEN when it's passed to the remote server, but the test expected wrongly that full string of application_name was always viewable. This commit changes the test so that it can handle that case. Author: Fujii Masao Reviewed-by: Masahiko Sawada, Hayato Kuroda, Kyotaro Horiguchi Discussion: https://postgr.es/m/3220909.1631054766@sss.pgh.pa.us Discussion: https://postgr.es/m/20211224.180006.2247635208768233073.horikyota.ntt@gmail.com Discussion: https://postgr.es/m/e7b61420-a97b-8246-77c4-a0d48fba5a45@oss.nttdata.com
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.