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https://issues.apache.org/jira/browse/KYLIN-4281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17047597#comment-17047597
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Shao Feng Shi commented on KYLIN-4281:
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+1
> Precisely set the data type of tuple expression
> -----------------------------------------------
>
> Key: KYLIN-4281
> URL: https://issues.apache.org/jira/browse/KYLIN-4281
> Project: Kylin
> Issue Type: Improvement
> Reporter: Zhong Yanghong
> Assignee: Zhong Yanghong
> Priority: Major
>
> Previously to simplify the calculating of sum(case when), all of the binary
> calculation is based on BigDecimal, which is not good for all, especially
> when dealing with count(distinct case when), whose inner data type may be hll
> or bitmap.
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