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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/04 08:17:59 UTC

[GitHub] [arrow] nosterlu commented on issue #13747: [Python] group_by functionality directly on large dataset, instead of on a table?

nosterlu commented on issue #13747:
URL: https://github.com/apache/arrow/issues/13747#issuecomment-1303104101

   @ritchie46, FYI, I changed the definition of the dataset to help polars with filtering the partitions like so
   
   ```python
   ibpolar = dataset("install-base-from-vdw-standard/vehicle_type=536/", filesystem=fs, partitioning="hive")
   ```
   polars now used half of the memory compared to duckdb, and spent 7 seconds vs 12 on duckdb.
   
   So being able to push down filters on partition columns would help a lot.


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