Joris Van den Bossche created ARROW-5857: --------------------------------------------
Summary: [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 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 -- This message was sent by Atlassian JIRA (v7.6.3#76005)