[jira] [Created] (IMPALA-11059) Speed up zipping unnest by reading collection elements in batches

["Daniel Becker (Jira)" <ji...@apache.org>]

Daniel Becker created IMPALA-11059:
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             Summary: Speed up zipping unnest by reading collection elements in batches 
                 Key: IMPALA-11059
                 URL: https://issues.apache.org/jira/browse/IMPALA-11059
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Daniel Becker
            Assignee: Daniel Becker


Try to speed up zipping unnest by reading collection elements in batches.

Now we read from the collections row-wise, that is we read one element from each collection and we store them in the corresponding columns in the current row, then proceed to the next element in each collection for the next row etc. The proposal here is to fill the row batch column-wise, i.e. filling the column corresponding to the first collection, then the second collection etc.



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