Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21073#discussion_r199374528
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CollectionExpressionsSuite.scala
---
@@ -20,6 +20,8 @@ package org.apache.spark.sql.catalyst.expressions
import java.sql.{Date, Timestamp}
import java.util.TimeZone
+import scala.collection.mutable
--- End diff --
Unnecessary import?
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