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https://issues.apache.org/jira/browse/SPARK-17881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15567226#comment-15567226
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Apache Spark commented on SPARK-17881:
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User 'wzhfy' has created a pull request for this issue:
https://github.com/apache/spark/pull/15443
> Aggregation function for generating string histograms
> -----------------------------------------------------
>
> Key: SPARK-17881
> URL: https://issues.apache.org/jira/browse/SPARK-17881
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Zhenhua Wang
>
> This agg function generates equi-width histograms for string type columns,
> with a maximum number of histogram bins. It returns a empty result if the
> ndv(number of distinct value) of the column exceeds the maximum number
> allowed.
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