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  1. Apache Arrow
  2. ARROW-4097

[C++] Add function to "conform" a dictionary array to a target new dictionary

    Details

    • Type: New Feature
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: 1.0.0
    • Component/s: C++
    • Labels:
      None

      Description

      Follow up work to ARROW-554.

      Unifying multiple dictionary-encoded arrays is one use case. Another is rewriting a DictionaryArray to be based on another dictionary. For example, this would be used to implement Cast from one dictionary type to another.

      This will need to be able to insert nulls where there are values that are not found in the target dictionary

      see also discussion at https://github.com/apache/arrow/pull/3165#discussion_r243025730

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            • Assignee:
              Unassigned
              Reporter:
              wesmckinn Wes McKinney
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              • Created:
                Updated: