[BUG] GPU file writes only test writing a single row group or stripe

[jlowe]

We recently ran into rapidsai/cudf#6763 which triggers when trying to write booleans with nulls. We test writing booleans to ORC in our integration tests, but those tests did not trigger the issue. They missed it because they only write a single stripe to each file, because so few rows are written. If the test had written enough rows to trigger more than one stripe, the bug would have been caught.

[ustcfy]

Based on the explanation in the comment here rapidsai/cudf#6763 (comment) and my experiment, generating multiple row groups can reproduce this error #11736 instead of multiple stripes.

[ustcfy]

So, is it necessary to generate multiple stripes? The default ORC stripe size is 64MB, I'm not sure if that is too large.👀