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https://issues.apache.org/jira/browse/SPARK-17997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15587548#comment-15587548
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Apache Spark commented on SPARK-17997:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/15544
> Aggregation function for counting distinct values for multiple intervals
> ------------------------------------------------------------------------
>
> Key: SPARK-17997
> URL: https://issues.apache.org/jira/browse/SPARK-17997
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Zhenhua Wang
>
> This is for computing ndv's for bins in equi-height histograms. A bin
> consists of two endpoints which form an interval of values and the ndv in
> that interval. For computing histogram statistics, after getting the
> endpoints, we need an agg function to count distinct values in each interval.
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