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https://issues.apache.org/jira/browse/ARROW-5859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-5859.
-----------------------------------
Resolution: Fixed
Issue resolved by pull request 5826
[https://github.com/apache/arrow/pull/5826]
> [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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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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