[jira] [Created] (ARROW-16121) [Python] Deprecate the (common_)metadata(_path) attributes of ParquetDataset

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-16121:
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             Summary: [Python] Deprecate the (common_)metadata(_path) attributes of ParquetDataset
                 Key: ARROW-16121
                 URL: https://issues.apache.org/jira/browse/ARROW-16121
             Project: Apache Arrow
          Issue Type: Sub-task
          Components: Python
            Reporter: Joris Van den Bossche
             Fix For: 8.0.0


The custom python ParquetDataset implementation exposes the {{metadata}}, {{metadata_path}}, {{common_metadata}} and {{common_metadata_path}} attributes, something for which we didn't add an equivalent to the new dataset API. 

Unless we still want to add something for this, we should deprecate those attributes in the legacy ParquetDataset. 

In addition, we should also deprecate passing the {{metadata}} keyword in the ParquetDataset constructor. 



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