anchor.diff:          S?SQL_SELECT.'WHERE'
       ).
   
  -less_than_or_equal_to_is_less_than_equality_filter_on_same_column_is_impossible_test() ->
  +% less_than_or_equal_to_is_less_than_equality_filter_on_same_column_is_impossible_test
  +
  +'< eliminated when greater than <= on same column_test'() ->
       DDL = get_ddl(
           "CREATE TABLE table1("
           "a TIMESTAMP NOT NULL, "
  
positive.code:             Acc2 = store_filter_check(Check2, Acc),
              Acc3 = append_to_eliminate_later(F_x, Acc2),
              {F, Acc3};
          #filtercheck{'=' = {_,_,{const,EqVal}}} when LtVal > EqVal ->
              %% existing equality check is less, eliminate this `>` filter.
              {eliminate, Acc};
  
negative.code:         S?SQL_SELECT.'WHERE'
      ).
  
  less_than_or_equal_to_is_less_than_equality_filter_on_same_column_is_impossible_test() ->
      DDL = get_ddl(
          "CREATE TABLE table1("
          "a TIMESTAMP NOT NULL, "
          "b SINT64 NOT NULL, "
          "PRIMARY KEY ((a),a,b))"),
      {ok, Q} = get_query(
          "SELECT * FROM table1 "
          "WHERE a = 1 AND b <= 8 AND b = 10"),
      ?assertEqual(
          {error,{impossible_where_clause, << >>}},
          compile(DDL, Q)
      ).
  
  less_than_or_equal_to_is_less_than_equality_filter_on_same_column_is_impossible_swap_filter_order_test() ->
      DDL = get_ddl(
          "CREATE TABLE table1("
          "a TIMESTAMP NOT NULL, "
  