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https://issues.apache.org/jira/browse/SPARK-22448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16445355#comment-16445355
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Dedunu Dhananjaya commented on SPARK-22448:
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I'm thinking about implementing this. Is it okay to start working on this?
> 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
>
> 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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