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https://issues.apache.org/jira/browse/KYLIN-2552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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XIE FAN updated KYLIN-2552:
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Description: In KYLIN-2518, we modify the hash algorithm in the
putRowKeyToHLL method in FactDistinictColumnsMapper. This optimization may
cause backward compatibility problems because different kylin version may use
different hash algorithm and this will cause inaccurate estimation of the
number of cuboids.
> Fix backward compatibility
> ---------------------------
>
> Key: KYLIN-2552
> URL: https://issues.apache.org/jira/browse/KYLIN-2552
> Project: Kylin
> Issue Type: Sub-task
> Reporter: XIE FAN
> Assignee: XIE FAN
> Fix For: v2.0.0
>
>
> In KYLIN-2518, we modify the hash algorithm in the putRowKeyToHLL method in
> FactDistinictColumnsMapper. This optimization may cause backward
> compatibility problems because different kylin version may use different hash
> algorithm and this will cause inaccurate estimation of the number of cuboids.
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