MXS-2621: Add test case

The test reproduces the problem with lower_case_table_names.

maxscale-system-test/CMakeLists.txt

@@ -389,6 +389,10 @@ add_test_executable(csmon_test.cpp csmon_test csmon_test LABELS csmon CS_BACKEND
 # END: ColumnStore tests                   #
 ############################################
 
+############################################
+# BEGIN: Normal tests                      #
+############################################
+
 # Test monitor state change events when manually clearing server bits
 add_test_executable(false_monitor_state_change.cpp false_monitor_state_change replication LABELS mysqlmon REPL_BACKEND)
 
@@ -972,6 +976,13 @@ add_test_executable(mxs2521_double_exec.cpp mxs2521_double_exec mxs2521_double_e
 # MXS-2490: Direct execution doesn't work with MaxScale
 add_test_executable(mxs2490_ps_execute_direct.cpp mxs2490_ps_execute_direct replication LABELS REPL_BACKEND readwritesplit)
 
+# MXS-2621: Incorrect SQL if lower_case_table_names is used.
+add_test_executable(mxs2621_lower_case_tables.cpp mxs2621_lower_case_tables mxs2621_lower_case_tables LABELS REPL_BACKEND)
+
+############################################
+# END: Normal tests                        #
+############################################
+
 ############################################
 # BEGIN: binlogrouter and avrorouter tests #
 ############################################

maxscale-system-test/cnf/maxscale.cnf.template.mxs2621_lower_case_tables

@@ -0,0 +1,26 @@
+[maxscale]
+threads=###threads###
+
+###server###
+
+[MySQL-Monitor]
+type=monitor
+module=mysqlmon
+servers=###server_line###
+user=maxskysql
+password=skysql
+monitor_interval=2000
+
+[RW-Split-Router]
+type=service
+router=readwritesplit
+servers=###server_line###
+user=maxskysql
+password=skysql
+
+[RW-Split-Listener]
+type=listener
+service=RW-Split-Router
+protocol=MySQLClient
+port=4006
+authenticator_options=lower_case_table_names=true

maxscale-system-test/mxs2621_lower_case_tables.cpp

@@ -0,0 +1,15 @@
+/**
+ * MXS-2621: Incorrect SQL if lower_case_table_names is used.
+ * https://jira.mariadb.org/browse/MXS-2621
+ */
+
+#include "testconnections.h"
+
+int main(int argc, char* argv[])
+{
+    TestConnections test(argc, argv);
+    test.maxscales->connect();
+    test.try_query(test.maxscales->conn_rwsplit[0], "SELECT 123");
+    test.maxscales->disconnect();
+    return test.global_result;
+}