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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/10/02 16:12:24 UTC

[GitHub] [arrow] jorisvandenbossche commented on pull request #8317: ARROW-10134: [Python][Dataset] Add ParquetFileFragment.num_row_groups

jorisvandenbossche commented on pull request #8317:
URL: https://github.com/apache/arrow/pull/8317#issuecomment-702823129


   I think the main reason such a property would be interesting for dask's use case is to get the number of row groups in a case all statistics are not available / not yet parsed. So the way that this PR returns `None` in that case is not super useful, I think.  
   I think ideally if the number of row groups is not know (the row_groups are not set), it would retrieve this information from the FileMetaData.


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