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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