add a test case for MySQL Bug #13889741: HANDLE_FATAL_SIGNAL IN _DB_ENTER_ |...

add a test case for MySQL Bug #13889741: HANDLE_FATAL_SIGNAL IN _DB_ENTER_ | HANDLE_FATAL_SIGNAL IN STRNLEN

mysql-test/r/information_schema.result

@@ -1673,4 +1673,6 @@ SELECT length(CAST(b AS CHAR)) FROM ubig;
 length(CAST(b AS CHAR))
 20
 DROP TABLE ubig;
+select 1 from information_schema.tables where table_schema=repeat('a', 2000);
+1
 End of 5.1 tests.

mysql-test/t/information_schema.test

@@ -1438,6 +1438,10 @@ SELECT length(CAST(b AS CHAR)) FROM ubig;
 
 DROP TABLE ubig;
 
+#
+# Bug #13889741: HANDLE_FATAL_SIGNAL IN _DB_ENTER_ | HANDLE_FATAL_SIGNAL IN STRNLEN
+#
+select 1 from information_schema.tables where table_schema=repeat('a', 2000);
 
 --echo End of 5.1 tests.