Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18113#discussion_r150391105 --- Diff: sql/core/src/main/java/org/apache/spark/sql/expressions/javalang/typed.java --- @@ -74,4 +71,40 @@ public static <T> TypedColumn<T, Long> sumLong(MapFunction<T, Long> f) { --- End diff -- we can also add average, which is already implemented.
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