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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