1 files changed, 39 insertions, 0 deletions
diff --git a/contrib/postgres_fdw/sql/postgres_fdw.sql b/contrib/postgres_fdw/sql/postgres_fdw.sql
index 30b5175da5b..20749868d31 100644
--- a/contrib/postgres_fdw/sql/postgres_fdw.sql
+++ b/contrib/postgres_fdw/sql/postgres_fdw.sql
@@ -3422,3 +3422,42 @@ CREATE FOREIGN TABLE inv_fsz (c1 int )
 -- Invalid batch_size option
 CREATE FOREIGN TABLE inv_bsz (c1 int )
 	SERVER loopback OPTIONS (batch_size '100$%$#$#');
+
+-- ===================================================================
+-- test postgres_fdw.application_name GUC
+-- ===================================================================
+-- Turn debug_discard_caches off for this test to make that
+-- the remote connection is alive when checking its application_name.
+-- For each test, close all the existing cached connections manually and
+-- establish connection with new setting of application_name.
+SET debug_discard_caches = 0;
+
+-- If appname is set as GUC but not as options of server object,
+-- the GUC setting is used as application_name of remote connection.
+SET postgres_fdw.application_name TO 'fdw_guc_appname';
+SELECT 1 FROM postgres_fdw_disconnect_all();
+SELECT 1 FROM ft6 LIMIT 1;
+SELECT application_name FROM pg_stat_activity
+       WHERE application_name IN ('loopback2', 'fdw_guc_appname');
+
+-- If appname is set as options of server object but not as GUC,
+-- appname of server object is used.
+RESET postgres_fdw.application_name;
+ALTER SERVER loopback2 OPTIONS (ADD application_name 'loopback2');
+SELECT 1 FROM postgres_fdw_disconnect_all();
+SELECT 1 FROM ft6 LIMIT 1;
+SELECT application_name FROM pg_stat_activity
+       WHERE application_name IN ('loopback2', 'fdw_guc_appname');
+
+-- If appname is set both as GUC and as options of server object,
+-- the GUC setting overrides appname of server object and is used.
+SET postgres_fdw.application_name TO 'fdw_guc_appname';
+SELECT 1 FROM postgres_fdw_disconnect_all();
+SELECT 1 FROM ft6 LIMIT 1;
+SELECT application_name FROM pg_stat_activity
+       WHERE application_name IN ('loopback2', 'fdw_guc_appname');
+
+--Clean up
+ALTER SERVER loopback2 OPTIONS (DROP application_name);
+RESET postgres_fdw.application_name;
+RESET debug_discard_caches;