[GitHub] [spark] viirya opened a new pull request #24557: [SPARK-27653][SQL] Add max_by() SQL aggregate function

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viirya opened a new pull request #24557: [SPARK-27653][SQL] Add max_by() SQL aggregate function
URL: https://github.com/apache/spark/pull/24557
 
 
   ## What changes were proposed in this pull request?
   
   This PR goes to add `max_by()` SQL aggregate function.
   
   Quoting from the [Presto docs](https://prestodb.github.io/docs/current/functions/aggregate.html#max_by)
   
   > max_by(x, y) → [same as x]
   > Returns the value of x associated with the maximum value of y over all input values.
   
   ## How was this patch tested?
   
   Added tests.

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