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Posted to issues@spark.apache.org by "Zhenhua Wang (JIRA)" <ji...@apache.org> on 2016/10/12 01:31:20 UTC

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

Zhenhua Wang created SPARK-17881:
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             Summary: 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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