[jira] [Commented] (ARROW-8131) [Python] Add dynamic attributes to PyArrow ExtensionArray

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

    [ https://issues.apache.org/jira/browse/ARROW-8131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17060787#comment-17060787 ] 

Joris Van den Bossche commented on ARROW-8131:
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We could also try to make it easier to subclass ExtensionArray? 
See also ARROW-6176

> [Python] Add dynamic attributes to PyArrow ExtensionArray
> ---------------------------------------------------------
>
>                 Key: ARROW-8131
>                 URL: https://issues.apache.org/jira/browse/ARROW-8131
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>    Affects Versions: 0.16.0
>         Environment: Ubuntu 19.10 + Python 3.7
>            Reporter: Paul Balanca
>            Priority: Major
>              Labels: Python3, pull-request-available
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> In the present implementation, the interface of the class `ExtensionArray` is not extendable by user. One can not easily inherit from it, as the constructor __init__ can not be called directly, or it does not allow adding dynamically atttributes.
> Keeping the current design with build methods `from_*`, I believe it could then make sense to allow dynamic attributes in `ExtensionArray` (see [https://cython.readthedocs.io/en/latest/src/userguide/extension_types.html#dynamic-attributes]). The runtime & size cost of the Python objects would be fairly minimal, compared to increased flexibility it would allow.
> A typical use case where it could be useful would be dynamic mixins (added by custom Factory), allowing projects based on PyArrow to extend (! :)) the interface with specific business logic. 



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