Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/22856#discussion_r228771390
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Average.scala
---
@@ -23,9 +23,21 @@ import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.util.TypeUtils
import org.apache.spark.sql.types._
-abstract class AverageLike(child: Expression) extends DeclarativeAggregate
{
--- End diff --
+1 for cleaning up this.
cc @mgaido91
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