Details
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Improvement
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Status: Closed
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Major
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Resolution: Won't Do
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0.16.0
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None
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Ubuntu 19.10 + Python 3.7
Description
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.
Attachments
Issue Links
- is related to
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ARROW-6176 [Python] Allow to subclass ExtensionArray to attach to custom extension type
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- Resolved
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- links to