message: Double unnest doesn't work (yet)
diff: @@ -78,12 +78,17 @@ SELECT ARRAY[[1, 2], [3, 4]]::VARCHAR[]
  ----
  [[1, 2], [3, 4]]
  +mode skip
  +
  +# FIXME: double unnest
  query I
  SELECT UNNEST(UNNEST(ARRAY[[1, 2], [3, 4]]::VARCHAR[][]))
  ----
  [1, 2]
  [3, 4]
  +mode unskip
  +
  query I
  SELECT UNNEST(ARRAY[[1, 2], [3, 4]]::VARCHAR[])
  ----
  