MDEV#5790 : SHOW GLOBAL STATUS LIKE does not show

the correct list of variables when using "_"

Fixed the type for offending "wsrep", wrongly
set to SHOW_SIMPLE_FUNC.

Added a test case.

mysql-test/suite/wsrep/r/variables.result

+#
+# MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
+# variables when using "_"
+#
+CALL mtr.add_suppression("WSREP: Could not open saved state file for reading.*");
+SHOW VARIABLES LIKE 'wsrep%';
+Variable_name	Value
+wsrep_osu_method	#
+wsrep_auto_increment_control	#
+wsrep_causal_reads	#
+wsrep_certify_nonpk	#
+wsrep_cluster_address	#
+wsrep_cluster_name	#
+wsrep_convert_lock_to_trx	#
+wsrep_data_home_dir	#
+wsrep_dbug_option	#
+wsrep_debug	#
+wsrep_desync	#
+wsrep_drupal_282555_workaround	#
+wsrep_forced_binlog_format	#
+wsrep_load_data_splitting	#
+wsrep_log_conflicts	#
+wsrep_max_ws_rows	#
+wsrep_max_ws_size	#
+wsrep_mysql_replication_bundle	#
+wsrep_node_address	#
+wsrep_node_incoming_address	#
+wsrep_node_name	#
+wsrep_notify_cmd	#
+wsrep_on	#
+wsrep_provider	#
+wsrep_provider_options	#
+wsrep_recover	#
+wsrep_replicate_myisam	#
+wsrep_retry_autocommit	#
+wsrep_slave_threads	#
+wsrep_sst_auth	#
+wsrep_sst_donor	#
+wsrep_sst_donor_rejects_queries	#
+wsrep_sst_method	#
+wsrep_sst_receive_address	#
+wsrep_start_position	#
+
+SHOW VARIABLES LIKE 'wsrep_%';
+Variable_name	Value
+wsrep_osu_method	#
+wsrep_auto_increment_control	#
+wsrep_causal_reads	#
+wsrep_certify_nonpk	#
+wsrep_cluster_address	#
+wsrep_cluster_name	#
+wsrep_convert_lock_to_trx	#
+wsrep_data_home_dir	#
+wsrep_dbug_option	#
+wsrep_debug	#
+wsrep_desync	#
+wsrep_drupal_282555_workaround	#
+wsrep_forced_binlog_format	#
+wsrep_load_data_splitting	#
+wsrep_log_conflicts	#
+wsrep_max_ws_rows	#
+wsrep_max_ws_size	#
+wsrep_mysql_replication_bundle	#
+wsrep_node_address	#
+wsrep_node_incoming_address	#
+wsrep_node_name	#
+wsrep_notify_cmd	#
+wsrep_on	#
+wsrep_provider	#
+wsrep_provider_options	#
+wsrep_recover	#
+wsrep_replicate_myisam	#
+wsrep_retry_autocommit	#
+wsrep_slave_threads	#
+wsrep_sst_auth	#
+wsrep_sst_donor	#
+wsrep_sst_donor_rejects_queries	#
+wsrep_sst_method	#
+wsrep_sst_receive_address	#
+wsrep_start_position	#
+# Should show nothing.
+SHOW VARIABLES LIKE 'x';
+Variable_name	Value
+# End of test.

mysql-test/suite/wsrep/t/variables.opt

+--binlog-format=row --wsrep-provider=/usr/lib/galera/libgalera_smm.so  --wsrep-cluster-address=gcomm://

mysql-test/suite/wsrep/t/variables.test

+--source include/have_wsrep.inc
+
+--echo #
+--echo # MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
+--echo # variables when using "_"
+--echo #
+
+CALL mtr.add_suppression("WSREP: Could not open saved state file for reading.*");
+
+--replace_column 2 #
+SHOW VARIABLES LIKE 'wsrep%';
+
+--echo
+--replace_column 2 #
+SHOW VARIABLES LIKE 'wsrep_%';
+
+--echo # Should show nothing.
+SHOW VARIABLES LIKE 'x';
+
+--echo # End of test.
+

sql/mysqld.cc

@@ -8691,7 +8691,7 @@ SHOW_VAR status_vars[]= {
   {"wsrep_provider_name",      (char*) &wsrep_provider_name,     SHOW_CHAR_PTR},
   {"wsrep_provider_version",   (char*) &wsrep_provider_version,  SHOW_CHAR_PTR},
   {"wsrep_provider_vendor",    (char*) &wsrep_provider_vendor,   SHOW_CHAR_PTR},
-  {"wsrep",                    (char*) &wsrep_show_status,       SHOW_SIMPLE_FUNC},
+  {"wsrep",                    (char*) &wsrep_show_status,       SHOW_FUNC},
 #endif
   {NullS, NullS, SHOW_LONG}
 };