Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/18113#discussion_r150381615 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/typedaggregators.scala --- @@ -26,43 +26,64 @@ import org.apache.spark.sql.expressions.Aggregator // This file defines internal implementations for aggregators. //////////////////////////////////////////////////////////////////////////////////////////////////// +class TypedSumDouble[IN](val f: IN => Double) + extends Aggregator[IN, java.lang.Double, java.lang.Double] { + + override def zero: java.lang.Double = 0.0 + override def reduce(b: java.lang.Double, a: IN): java.lang.Double = --- End diff -- I'm -1 on this change, it introduces a lot of overhead because of boxing. Can we revert it back and use `toColumnJava`?
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