[jira] [Closed] (SPARK-18000) Aggregation function for computing bins (distinct value, count) pairs for equi-width histograms

["Reynold Xin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-18000?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin closed SPARK-18000.
-------------------------------
    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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