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https://issues.apache.org/jira/browse/KYLIN-1635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15481965#comment-15481965
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Billy(Yiming) Liu commented on KYLIN-1635:
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Hi [~liyang.g...@gmail.com], is this fixed already?
https://github.com/apache/kylin/commit/cfbf43b8cdec59532964d45ffa763d8891973c84
https://github.com/apache/kylin/commit/44c6fc9b8f5b39d217466a2b7887730a82566712
https://github.com/apache/kylin/commit/44ce1354ba1c0d7e895d39ee0b39a8f95c74654b
> HyperLogLogCounter (HLLC) performance improvement when add 0 or 1 elements
> --------------------------------------------------------------------------
>
> Key: KYLIN-1635
> URL: https://issues.apache.org/jira/browse/KYLIN-1635
> Project: Kylin
> Issue Type: Improvement
> Reporter: liyang
> Assignee: liyang
>
> Apply a trick to greatly speed up HLLC when merging another HLLC which
> contains only 0 or 1 element.
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