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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