Yerui Sun created KYLIN-2088:

             Summary: Support intersect count for calculation of retention or 
conversion rates
                 Key: KYLIN-2088
             Project: Kylin
          Issue Type: New Feature
          Components: Query Engine
            Reporter: Yerui Sun
            Assignee: Yerui Sun

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 
I'll try on this and post patch later.

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