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https://issues.apache.org/jira/browse/KYLIN-2088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15574410#comment-15574410
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liyang commented on KYLIN-2088:
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Right now, the MeasureType extension point represents a combination of
aggregation function and data type. If follow this design, then two MeasureType
need to be declared -- COUNT_DISTINCT(BITMAP) and INTERSECT_COUNT(BITMAP).
Also the current UDF is a little duplicated with MeasureType, I may combine
them into one.
> 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
> 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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