Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18113#discussion_r154887281
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/typedaggregators.scala
---
@@ -17,8 +17,10 @@
package org.apache.spark.sql.execution.aggregate
+import java.lang
--- End diff --
usually we do `import java.lang.{Long => JLong}`
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