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https://issues.apache.org/jira/browse/DRILL-6503?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516445#comment-16516445
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ASF GitHub Bot commented on DRILL-6503:
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sohami opened a new pull request #1328: DRILL-6503: Performance improvements in
lateral
URL: https://github.com/apache/drill/pull/1328
@parthchandra - Please help to review.
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> Performance improvements in lateral
> -----------------------------------
>
> Key: DRILL-6503
> URL: https://issues.apache.org/jira/browse/DRILL-6503
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.14.0
> Reporter: Sorabh Hamirwasia
> Assignee: Sorabh Hamirwasia
> Priority: Major
> Fix For: 1.14.0
>
>
> In LateralJoin currently the copying of data from left and right inputs is
> not very efficient. Basically for the number of rows seen in right side (let
> say n), it does copy row by row across all vectors in left and right inputs.
> Whereas if it copies each vectors (n times) and then move to next vector that
> can help in improving the performance.
> Also today MemoryManager::update can be called in lateral multiple times for
> left and right incoming. These calls are found to be very expensive hence
> make sure it's called only once for every new incoming from both left and
> right.
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