message: Brackets in comparisons
diff: @@ -33,15 +33,15 @@ INSERT INTO tbl SELECT NULL FROM (VALUES (1, 2))
  query I
  SELECT * FROM reduce_sql_statement('UPDATE tbl SET i=3, j=4 WHERE z=5') ORDER BY 1
  ----
  -UPDATE tbl SET i=3 WHERE z = 5
  +UPDATE tbl SET i=3 WHERE (z) = (5)
  UPDATE tbl SET i=3, j=4
  UPDATE tbl SET i=3, j=4 WHERE NULL
  -UPDATE tbl SET j=4 WHERE z = 5
  +UPDATE tbl SET j=4 WHERE (z) = (5)
  query I
  SELECT * FROM reduce_sql_statement('DELETE FROM a WHERE i >= 2000 AND i < 5000;') ORDER BY 1
  ----
  DELETE FROM a
  +DELETE FROM a WHERE (i) < (5000)
  +DELETE FROM a WHERE (i) >= (2000)
  DELETE FROM a WHERE NULL
  -DELETE FROM a WHERE i < 5000
  -DELETE FROM a WHERE i >= 2000
  