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https://issues.apache.org/jira/browse/KYLIN-2088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15737937#comment-15737937
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hongbin ma commented on KYLIN-2088:
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sorry, it should be Yerui :)
> Support intersect count for calculation of retention or conversion rates
> ------------------------------------------------------------------------
>
> Key: KYLIN-2088
> URL: https://issues.apache.org/jira/browse/KYLIN-2088
> Project: Kylin
> Issue Type: New Feature
> Components: Query Engine
> Reporter: Yerui Sun
> Assignee: Yerui Sun
> Fix For: v1.6.0
>
> Attachments: KYLIN-2088.patch
>
>
> Retention or Conversion Rates is very important in data analyze.
> It can be calculated from two dataset of two different value of one
> dimension. For example, we have an count distinct measure, like uv(dataset of
> uuid), and one dimension, like date, and the retention of uv between
> '20161015' and '20161016' is the intersection of two uv datasets.
> Fortunately, we have implement dataset in Kylin, as bitmap, for precisely
> count distinct. Only an UDAF is needed to calculate intersection of two or
> more bitmaps.
> I'll try on this and post patch later.
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