Zhenhua Wang created SPARK-17997:
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Summary: 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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