liyang commented on KYLIN-2088:

I've done the refactor and merged back to master.

Refactoring is pretty straightforward. MeasureType now support multiple UDAF on 
a type. Also removed the repeated declaration of UDF.

[~sunyerui], please double check on the master branch.

> 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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