Yerui Sun created KYLIN-2088:
Summary: Support intersect count for calculation of retention or
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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