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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5859?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-5859:
----------------------------------
    Labels: pull-request-available  (was: )

> [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
>
>
> 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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