MXS-1733 Add test for revealing the problem

maxscale-system-test/masking/masking_mysqltest/masking_rules.json

@@ -39,6 +39,15 @@
                 "value": "01234-BCD",
                 "fill": "X#@"
             }
+        },
+        {
+            "replace": {
+                "table": "masking_mxs1733",
+                "column": "email"
+            },
+            "with": {
+                "fill": "*"
+            }
         }
     ]
 }

maxscale-system-test/masking/masking_mysqltest/r/masking_mxs1733.result

@@ -0,0 +1,11 @@
+drop database if exists maskingdb;
+create database maskingdb;
+use maskingdb;
+create table masking_mxs1733 (email TEXT);
+insert into masking_mxs1733 values ("john@example.com");
+select * from masking_mxs1733;
+email
+****************
+select * from masking_mxs1733 UNION select * from masking_mxs1733;
+email
+****************

maxscale-system-test/masking/masking_mysqltest/t/masking_mxs1733.test

@@ -0,0 +1,17 @@
+#
+# MXS-1733
+#
+# See ../masking_rules.json
+
+--disable_warnings
+drop database if exists maskingdb;
+--enable_warnings
+
+create database maskingdb;
+use maskingdb;
+
+create table masking_mxs1733 (email TEXT);
+insert into masking_mxs1733 values ("john@example.com");
+
+select * from masking_mxs1733;
+select * from masking_mxs1733 UNION select * from masking_mxs1733;