Hi, As a part of the process of reducing test size in this pull request https://github.com/apache/arrow/pull/8648 <https://github.com/apache/arrow/pull/8648> which contains the ORC writer for C++ and Python I wrote a random chunked array generator and a random table generator. To reduce test size to ideal levels it will be necessary to improve arrow::random::RandomArrayGenerator::ArrayOf to support nested types. I really don’t think such work really belongs to the ORC writer PR. Shall I first try to get this PR to pass and then file a separate one with improvements in arrow/testing/random or shall I file them together as one PR? Thanks!
Ying
