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Posted to issues@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2022/02/04 11:35:00 UTC

[jira] [Created] (ARROW-15564) [C++] Expose MergeOptions in Concatenate to unify types

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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