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https://issues.apache.org/jira/browse/ARROW-6926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975268#comment-16975268
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Matthew Rocklin commented on ARROW-6926:
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Someone ended up contributing these to Dask (we have a diispatch mechanism to
work around these not being implemented upstream). Obviously it would have
been nicer for this code to be implemented in Arrow originally, but I thought
I'd point to it here in case it's helpful to others.
https://github.com/dask/dask/blob/539d1e27a8ccce01de5f3d49f1748057c27552f2/dask/sizeof.py#L115-L145
> [Python] Support __sizeof__ protocol for Python objects
> -------------------------------------------------------
>
> Key: ARROW-6926
> URL: https://issues.apache.org/jira/browse/ARROW-6926
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Matthew Rocklin
> Priority: Minor
> Fix For: 1.0.0
>
>
> It would be helpful if PyArrow objects implemented the `__sizeof__` protocol
> to give other libraries hints about how much data they have allocated. This
> helps systems like Dask, which have to make judgements about whether or not
> something is cheap to move or taking up a large amount of space.
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