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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