[
https://issues.apache.org/jira/browse/ARROW-8131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17060833#comment-17060833
]
Paul Balanca commented on ARROW-8131:
-------------------------------------
I thought at first it was a design choice in Arrow to make the inheritance hard
(specialized builder methods {{from_*}})
My first try & intuition was in fact to go for inheritance, and your
proposition of adding{{ ExtentionType.__arrow_ext_class__}} sounds like a
cleaner solution than trying to dynamically add properties to every instance
generated. Let me see if I can make it working the way you suggested.
> [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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
