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  1. Apache Arrow
  2. ARROW-8644

[Python] Dask integration tests failing due to change in not including partition columns

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      In ARROW-3861 (https://github.com/apache/arrow/pull/7050), I "fixed" a bug that the partition columns are always included even when the user did a manual column selection.

      But apparently, this behaviour was being relied upon by dask. See the failing nightly integration tests: https://circleci.com/gh/ursa-labs/crossbow/11854?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

      So the best option might be to just keep the "old" behaviour for the legacy ParquetDataset, when using the new datasets API (use_legacy_datasets=False), you get the new / correct behaviour.

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              jorisvandenbossche Joris Van den Bossche
              jorisvandenbossche Joris Van den Bossche
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