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https://issues.apache.org/jira/browse/ARROW-5857?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche closed ARROW-5857.
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Resolution: Duplicate
There was actually already an open issue for this: ARROW-5645
> [Python] converting multidimensional numpy arrays to nested list type
> ---------------------------------------------------------------------
>
> Key: ARROW-5857
> URL: https://issues.apache.org/jira/browse/ARROW-5857
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Joris Van den Bossche
> Priority: Major
>
> Currently we only support 1-dimensional numpy arrays:
> {code:python}
> In [28]: pa.array([np.array([[1, 2], [3, 4]])],
> type=pa.list_(pa.list_(pa.int64())))
> ...
> ArrowInvalid: Can only convert 1-dimensional array values
> {code}
> So to create a nested list array, you can do that with lists of lists or
> object numpy arrays with arrays as elements. We could expand this support to
> multi-dimensional numpy arrays.
> I am not sure we should do inference by default for this case, but at least
> when specifying a nested ListType, this would be nice.
> It can be an alternative way to have some support for tensors, next to an
> ExtensionType (ARROW-1614 / ARROW-5819)
> Related discussions:
> https://lists.apache.org/thread.html/9b142c1709aa37dc35f1ce8db4e1ced94fcc4cdd96cc72b5772b373b@%3Cdev.arrow.apache.org%3E,
> https://github.com/apache/arrow/issues/4802
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