message: More incorrect timestamp test cases
diff: @@ -29,10 +29,16 @@ SELECT timestamp ' 2017-07-23 13:10:11 ';
  ----
  2017-07-23 13:10:11
  -# other trailing gunk is not accepted
  +# other trailing, preceding, or middle gunk is not accepted
  statement error
  SELECT timestamp ' 2017-07-23 13:10:11 AA';
  +statement error
  +SELECT timestamp 'AA2017-07-23 13:10:11';
  +
  +statement error
  +SELECT timestamp '2017-07-23A13:10:11';
  +
  query T
  SELECT t FROM timestamp ORDER BY t;
  ----
  