[
https://issues.apache.org/jira/browse/IMPALA-11059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Becker resolved IMPALA-11059.
------------------------------------
Resolution: Won't Fix
> 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
> Priority: Major
> Labels: performance
>
> 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.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
