Joris Van den Bossche created ARROW-15564:
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Summary: [C++] Expose MergeOptions in Concatenate to unify types
Key: ARROW-15564
URL: https://issues.apache.org/jira/browse/ARROW-15564
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Joris Van den Bossche
The {{arrow::ConcatenateTables}} function exposes the {{Field::MergeOptions}}
as a way to indicate how fields with different types should be merged
("unified" / "common type").
The version to concatenate arrays ({{arrow::Concatenate}}) currently requires
all same-typed arrays. We could add a MergeOptions option here as well?
(this depends on ARROW-14705 to make this option more useful, currently it only
handles null -> any upcasts, I think)
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