[jira] [Created] (ARROW-5859) [Python] Support ExtentionType on conversion to numpy/pandas

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

Joris Van den Bossche created ARROW-5859:
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             Summary: [Python] Support ExtentionType on conversion to numpy/pandas
                 Key: ARROW-5859
                 URL: https://issues.apache.org/jira/browse/ARROW-5859
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Joris Van den Bossche


Currently converting a Table of RecordBatch with an ExtensionType array to pandas gives:

{{code}}
ArrowNotImplementedError: No known equivalent Pandas block for Arrow data of type extension<arrow.py_extension_type> is known.
{{code}}

And similarly converting the array itself to a python object (to_pandas or to_pylist) gives an ArrowNotImplementedError or a "KeyError: 28"

Initial support could be to fall back to the storage type.



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