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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