Ying Zhou created ARROW-11118:
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Summary: [C++] Add union support in ORC reader & writer
Key: ARROW-11118
URL: https://issues.apache.org/jira/browse/ARROW-11118
Project: Apache Arrow
Issue Type: New Feature
Reporter: Ying Zhou
Currently the ORC reader does not has support for the ORC UNION type which led
to the ORC writer to be under-tested for ORC DENSE_UNION and SPARSE_UNION
types. To fix this problem union support in the ORC reader needs to be added,
union support in the ORC writer needs to be added and tested.
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