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Posted to issues@spark.apache.org by "Zhenhua Wang (JIRA)" <ji...@apache.org> on 2017/09/12 12:56:00 UTC
[jira] [Updated] (SPARK-17997) Aggregation function for counting
distinct values for multiple intervals
[ https://issues.apache.org/jira/browse/SPARK-17997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhenhua Wang updated SPARK-17997:
---------------------------------
Issue Type: New Feature (was: Sub-task)
Parent: (was: SPARK-16026)
> 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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