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Posted to issues@arrow.apache.org by "Paul Balanca (Jira)" <ji...@apache.org> on 2020/03/16 10:00:00 UTC

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

Paul Balanca created ARROW-8131:
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             Summary: 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


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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