anchor.diff:  
   select_negation_test() ->
       DDL = get_sel_ddl(),
  -    SQL = "SELECT -1, - 1, -1.0, - 1.0, -mydouble, - mydouble from mytab "
  +    SQL = "SELECT -1, - 1, -1.0, - 1.0, -mydouble, - mydouble, -(1), -(1.0) from mytab "
           "WHERE myfamily = 'familyX' AND myseries = 'seriesX' "
           "AND time > 1 AND time < 2",
       {ok, Rec} = get_query(SQL),
  
positive.code:                                                          double,
                                                           double,
                                                           double,
                                                           double
                                                          ],
                                       col_names        = [
  
negative.code:                                                          <<"-1.0">>,
                                                           <<"-1.0">>,
                                                           <<"-mydouble">>,
                                                           <<"-mydouble">>,
                                                           <<"-1">>,
                                                           <<"-1.0">>
                                                          ]
                                      },
                   Sel).
  