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https://issues.apache.org/jira/browse/KUDU-2429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Berkeley resolved KUDU-2429.
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Resolution: Fixed
Todd did this in 7201b0635a448cd244dc598158b13226f14aa0fb
> Improve performance of scans on tablets with large blocks of deleted rows
> -------------------------------------------------------------------------
>
> Key: KUDU-2429
> URL: https://issues.apache.org/jira/browse/KUDU-2429
> Project: Kudu
> Issue Type: Improvement
> Components: cfile, tablet
> Affects Versions: 1.7.0
> Reporter: Will Berkeley
> Assignee: Todd Lipcon
> Priority: Major
> Fix For: 1.8.0
>
>
> Scanning tablets where many of the rows have been deleted is often very slow,
> since the deletes need to be applied as deltas. It's possible to speed this
> up in cases where an entire block has been deleted by
> 1. skipping column materialization for a block if all rows have been deleted
> 2. skipping reading the selection vector for each column if we know the
> entire block is deleted and thus contains no results
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