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https://issues.apache.org/jira/browse/SPARK-18000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin closed SPARK-18000.
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Resolution: Won't Fix
Marking this as won't fix, since it looks like combination of count-min sketch
& histogram is strictly better than this.
> Aggregation function for computing bins (distinct value, count) pairs for
> equi-width histograms
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-18000
> URL: https://issues.apache.org/jira/browse/SPARK-18000
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Zhenhua Wang
>
> This function computes the count for each distinct non-null value of a column.
> It returns:
> 1. null if the table is empty or all values of the column are null.
> 2. (distinct non-null value, frequency) pairs if the number of distinct
> non-null values is less than or equal to the specified threshold.
> 3. an empty result if the number of distinct non-null values exceeds that
> threshold.
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