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Posted to dev@arrow.apache.org by "Neal Richardson (Jira)" <ji...@apache.org> on 2019/10/28 20:15:00 UTC

[jira] [Created] (ARROW-7012) [C++] Clarify ChunkedArray chunking strategy and policy

Neal Richardson created ARROW-7012:
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             Summary: [C++] Clarify ChunkedArray chunking strategy and policy
                 Key: ARROW-7012
                 URL: https://issues.apache.org/jira/browse/ARROW-7012
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
            Reporter: Neal Richardson


See discussion on ARROW-6784 and [https://github.com/apache/arrow/pull/5686]. Among the questions:
 * Do Arrow users control the chunking, or is it an internal implementation detail they should not manage?
 * If users control it, how do they control it? E.g. if I call Take and use a ChunkedArray for the indices to take, does the chunking follow how the indices are chunked? Or should we attempt to preserve the mapping of data to their chunks in the input table/chunked array?
 * If it's an implementation detail, what is the optimal chunk size? And when is it worth reshaping (concatenating, slicing) input data to attain this optimal size? 



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