message: fix gcc4.8 failed test
diff: @@ -51,7 +51,7 @@ SELECT * FROM read_csv_auto('data/csv/union-by-name/ubn*.csv')
  query IIIII
  SELECT a, b, c, ts, k
  FROM read_csv_auto('data/csv/union-by-name/ubn*.csv',UNION_BY_NAME=TRUE)
  -ORDER BY a
  +ORDER BY a, c, ts
  ----
  NULL NULL 3 2003-06-30 12:03:10 6
  NULL NULL 5 2003-06-30 12:03:10 6
  @@ -71,7 +71,7 @@ test 88 NULL 2020-12-30 01:25:58.745232+01 NULL
  query IIIII
  SELECT a, b, c, ts, replace(filename, '\', '/')
  FROM read_csv_auto('data/csv/union-by-name/ubn[12].csv',FILENAME=TRUE ,UNION_BY_NAME=TRUE)
  -ORDER BY a
  +ORDER BY a, c, ts
  ----
  1 2 3 NULL data/csv/union-by-name/ubn1.csv
  3 4 5 NULL data/csv/union-by-name/ubn1.csv
  @@ -85,14 +85,14 @@ test 88 NULL 2020-12-30 00:25:58.745232 data/csv/union-by-name/ubn2.csv
  query IIII
  SELECT k, c, ts, replace(filename, '\', '/')
  FROM read_csv_auto('data/csv/union-by-name/ubn[!1-2].csv',FILENAME=TRUE ,UNION_BY_NAME=TRUE)
  -ORDER BY k
  +ORDER BY c
  ----
  -NULL 100 Monday data/csv/union-by-name/ubn4.csv
  -NULL 200 Sunday data/csv/union-by-name/ubn4.csv
  -NULL 300 Friday data/csv/union-by-name/ubn4.csv
  6 3 2003-06-30 12:03:10 data/csv/union-by-name/ubn3.csv
  6 5 2003-06-30 12:03:10 data/csv/union-by-name/ubn3.csv
  6 6 2003-06-30 12:03:10 data/csv/union-by-name/ubn3.csv
  +NULL 100 Monday data/csv/union-by-name/ubn4.csv
  +NULL 200 Sunday data/csv/union-by-name/ubn4.csv
  +NULL 300 Friday data/csv/union-by-name/ubn4.csv
  # Test hive_partition with union_by_name
  statement error
  