Github user viirya commented on the issue: https://github.com/apache/spark/pull/19082 After quickly scanning this change, I found actually this and #18931 are orthogonal. This PR goes to split the aggregation expressions into functions. So it prevents long aggregation code caused by long gen'd codes expressions like `Kurtosis`. #18931 goes to break the long gen'd codes caused by chain of execution operators by splitting gen'd codes of operators into functions.
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