Wes McKinney created ARROW-554:
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Summary: [C++] Implement functions to conform unequal dictionaries
amongst multiple Arrow arrays
Key: ARROW-554
URL: https://issues.apache.org/jira/browse/ARROW-554
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Reporter: Wes McKinney
We may wish to either
* Conform the dictionary indices to reference a common dictionary
* Concatenate indices into a new array with a common dictionary
This is related to in-memory dictionary encoding, as you start with a
partially-built dictionary and then add entries as you observe new ones in
other dictionaries, all the while "rebasing" indices to consistently reference
the same dictionary at the end
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