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Posted to issues@kudu.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2017/03/06 22:24:32 UTC

[jira] [Assigned] (KUDU-646) Check the scan type before applying the selection vector

     [ https://issues.apache.org/jira/browse/KUDU-646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang reassigned KUDU-646:
--------------------------------

    Assignee:     (was: Andrew Wang)

> Check the scan type before applying the selection vector
> --------------------------------------------------------
>
>                 Key: KUDU-646
>                 URL: https://issues.apache.org/jira/browse/KUDU-646
>             Project: Kudu
>          Issue Type: Improvement
>          Components: perf, tablet
>    Affects Versions: M5
>            Reporter: Andrew Wang
>            Priority: Trivial
>
> As pointed out during code review of the MergeIterator, after merging the selection vector is all true (all rows selected).
> This means during a scan, if we are using the MergeIterator, we can skip checking the resulting SelectionVector. This will save us some CPU.



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