[jira] [Updated] (SPARK-22448) Add functions like Mode(), NumNulls(), etc. in Summarizer

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon updated SPARK-22448:
---------------------------------
    Labels: bulk-closed  (was: )

> Add functions like Mode(), NumNulls(), etc. in Summarizer
> ---------------------------------------------------------
>
>                 Key: SPARK-22448
>                 URL: https://issues.apache.org/jira/browse/SPARK-22448
>             Project: Spark
>          Issue Type: New Feature
>          Components: Optimizer
>    Affects Versions: 2.2.0
>            Reporter: Abdeali Kothari
>            Priority: Trivial
>              Labels: bulk-closed
>
> Would be very useful to have a MODE() function in the Summary statistics currently supported by DataSets.
> I can see that the Summarizer has many useful functions in 2.3.0 and it would be useful to add the following to it:
>  - Mode - Element that occurs maximum number of times
>  - CSS - Cumulative Sum of Squares ... Sum((x - mean)^2)
>  - NumNull - The number of values that are NULL in the column
>  - SUM - Just the sum of the column ...



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