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[jira] [Created] (ARROW-4083) [C++] Allowing ChunkedArrays to contain a mix of DictionaryArray and dense Array (of the dictionary type)


Wes McKinney created ARROW-4083:
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             Summary: [C++] Allowing ChunkedArrays to contain a mix of DictionaryArray and dense Array (of the dictionary type)
                 Key: ARROW-4083
                 URL: https://issues.apache.org/jira/browse/ARROW-4083
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.13.0


In some applications we may receive a stream of some dictionary encoded data followed by some non-dictionary encoded data. For example this happens in Parquet files when the dictionary reaches a certain configurable size threshold.

We should think about how we can model this in our in-memory data structures, and how it can flow through to relevant computational components (i.e. certain data flow observers -- like an Aggregation -- might need to be able to process either a dense or dictionary encoded version of a particular array in the same stream)



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