anchor.diff:      {Field, FieldType, _OldVal} = lists:keyfind(Field, 1, TupleList),
       lists:keyreplace(Field, 1, TupleList, {Field, FieldType, NewVal}).
   
  --record(filtercheck, {name,'=','>'}).
  +-record(filtercheck, {name,'=','>','>='}).
   
   check_where_clause_is_possible(DDL, WhereProps) ->
       Filter1 = proplists:get_value(filter, WhereProps),
  
positive.code:             Acc3 = append_to_eliminate_later(F_x, Acc2),
              {F, Acc3}
      end;
  check_where_clause_is_possible_fold(_, _, Filter, Acc) ->
      {Filter, Acc}.
  
  
negative.code:         S?SQL_SELECT.'WHERE'
      ).
  
  same_great_than_or_equals_check_is_not_in_filter_twice_test() ->
      DDL = get_ddl(
          "CREATE TABLE table1("
          "a TIMESTAMP NOT NULL, "
          "b SINT64 NOT NULL, "
          "PRIMARY KEY ((a),a))"),
      {ok, Q} = get_query(
          "SELECT * FROM table1 "
          "WHERE a = 5 AND b >= 10 AND b >= 10"),
      {ok, [S|_]} = compile(DDL, Q),
      ?assertPropsEqual(
          [{startkey,[{<<"a">>,timestamp,5}]},
           {endkey,  [{<<"a">>,timestamp,5}]},
           {filter, {'>=',{field,<<"b">>,sint64},{const, 10}}},
           {end_inclusive,true}],
          S?SQL_SELECT.'WHERE'
      ).
  
  second_greater_than_or_equal_check_which_is_a_greater_value_is_removed_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 = 5 AND b >= 10 AND b >= 11"),
      {ok, [S|_]} = compile(DDL, Q),
      ?assertPropsEqual(
          [{startkey,[{<<"a">>,timestamp,5}]},
           {endkey,  [{<<"a">>,timestamp,5}]},
           {filter, {'>=',{field,<<"b">>,sint64},{const, 10}}},
           {end_inclusive,true}],
          S?SQL_SELECT.'WHERE'
      ).
  
  second_greater_than_or_equal_check_which_is_a_lesser_value_removes_the_first_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 = 5 AND b >= 11 AND b >= 10"),
      {ok, [S|_]} = compile(DDL, Q),
      ?assertPropsEqual(
          [{startkey,[{<<"a">>,timestamp,5}]},
           {endkey,  [{<<"a">>,timestamp,5}]},
           {filter, {'>=',{field,<<"b">>,sint64},{const, 10}}},
           {end_inclusive,true}],
          S?SQL_SELECT.'WHERE'
      ).
  
  -endif.
  