[jira] [Assigned] (ARROW-3829) [Python] Support protocols to extract Arrow objects from third-party classes

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

     [ https://issues.apache.org/jira/browse/ARROW-3829?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joris Van den Bossche reassigned ARROW-3829:
--------------------------------------------

    Assignee: Joris Van den Bossche  (was: Uwe L. Korn)

> [Python] Support protocols to extract Arrow objects from third-party classes
> ----------------------------------------------------------------------------
>
>                 Key: ARROW-3829
>                 URL: https://issues.apache.org/jira/browse/ARROW-3829
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Uwe L. Korn
>            Assignee: Joris Van den Bossche
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> In the style of NumPy's {{__array__}}, we should be able to ask inputs to {{pa.array}}, {{pa.Table.from_X}}, ... whether they can convert themselves to Arrow objects. This would allow for example to turn objects that hold an Arrow object internally to expose them directly instead of going a conversion path.
> My current use case involves Pandas {{ExtensionArray}} instances that internally have Arrow objects and should be reused when we pass the whole {{DataFrame}} to {{pa.Table.from_pandas}}.



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