text: -- tkt2927.test
  -- 
  -- db eval {
  --     SELECT a, abs(b) FROM t1
  --     INTERSECT
  --     SELECT a, abs(b) FROM t1
  --     ORDER BY 1
  -- }
  SELECT a, abs(b) FROM t1
  INTERSECT
  SELECT a, abs(b) FROM t1
  ORDER BY 1