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https://issues.apache.org/jira/browse/KYLIN-2049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086755#comment-16086755
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Jack commented on KYLIN-2049:
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The count(case when), count(distinct case when), count(null column) will always
return the whole row count without any filter, sum(case when) seemed had been
fixed, hope this issue could be solved in the future.
> Incorrect AVG result with NULL measure values
> ---------------------------------------------
>
> Key: KYLIN-2049
> URL: https://issues.apache.org/jira/browse/KYLIN-2049
> Project: Kylin
> Issue Type: Bug
> Reporter: liyang
>
> Thanks to Itay. From -
> http://stackoverflow.com/questions/39664918/apache-kylin-null-value-measures-become-zeros
> I'm trying to build a Kylin Cube that will get me the Average of a SmallInt
> nullable column Col1. I expect any null value to not be counted towards this
> average. When I work on my table in Hive this is exactly the result that I'm
> getting when applying the AVG function. However when I build the cube in
> Kylin on top of this table all the null values in my measurements columns are
> becoming zeros and then counted towards the calculation of the AVG. Is there
> a way to force Kylin to treat nulls as nulls?
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