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Posted to dev@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2018/12/19 18:21:00 UTC
[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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