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https://issues.apache.org/jira/browse/KYLIN-4666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17205366#comment-17205366
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Guangxu Cheng commented on KYLIN-4666:
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duplicate of [KYLIN-4567|https://github.com/apache/kylin/pull/1259] ?
> Improve TopNCounter's merge performance
> ---------------------------------------
>
> Key: KYLIN-4666
> URL: https://issues.apache.org/jira/browse/KYLIN-4666
> Project: Kylin
> Issue Type: Improvement
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
>
> Currently, we need to do sort for very merge operation, which will cost much
> time for thousands of merges. It's better to leverage a bit more buffer to
> reduce the chance of sort
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