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Alenka Frim authored and Krisztián Szűcs committed a16be6b7b6c
ARROW-16121: [Python] Deprecate the (common_)metadata(_path) attributes of ParquetDataset This PR tries to: - deprecate the `metadata,` `metadata_path` and `common_metadata_path` attributes in the legacy ParquetDataset. - deprecate passing the `metadata` keyword in the ParquetDataset constructor. `common_metadata` attribute has already been deprecated. Closes #12952 from AlenkaF/ARROW-16121 Lead-authored-by: Alenka Frim <frim.alenka@gmail.com> Co-authored-by: Alenka Frim <AlenkaF@users.noreply.github.com> Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>