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Posted to dev@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2020/04/23 19:20:00 UTC

[jira] [Created] (ARROW-8572) [Python] Expose UnionArray.array and other fields

David Li created ARROW-8572:
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             Summary: [Python] Expose UnionArray.array and other fields
                 Key: ARROW-8572
                 URL: https://issues.apache.org/jira/browse/ARROW-8572
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
    Affects Versions: 0.17.0
            Reporter: David Li
            Assignee: David Li


Currently in Python, you can construct a UnionArray easily, but getting the data back out (without copying) is near-impossible. We should expose the getter for UnionArray.array so we can pull out the constituent arrays. We should also expose fields like mode while we're at it.

The use case is: in Flight, we'd like to write multiple distinct datasets (with distinct schemas) in a single logical call; using UnionArrays lets us combine these datasets into a single logical dataset.



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