Wes McKinney created ARROW-8866:
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Summary: [C++] Split Type::UNION into Type::SPARSE_UNION and
Type::DENSE_UNION
Key: ARROW-8866
URL: https://issues.apache.org/jira/browse/ARROW-8866
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
Fix For: 1.0.0
Similar to the recent {{Type::INTERVAL}} split, having these two array types
which have different memory layouts under the same {{Type::type}} value makes
function dispatch somewhat more complicated. This issue is less critical from
INTERVAL so this may not be urgent but seems like a good pre-10 change
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