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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/10/12 01:37:20 UTC

[jira] [Assigned] (SPARK-17881) Aggregation function for generating string histograms

     [ https://issues.apache.org/jira/browse/SPARK-17881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-17881:
------------------------------------

    Assignee:     (was: Apache Spark)

> 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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