jorisvandenbossche commented on pull request #7623: URL: https://github.com/apache/arrow/pull/7623#issuecomment-654709090
> What happens if a certain row group column has only nulls? Is the min/max then also null, or is it not defined? (might be good to add a test case for this) It seems we don't write min/max statistics in such a case (`has_min_max` is False), leading to an empty `statistics` struct, and thus empty dict in python. Added a test for this. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
