Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/21073#discussion_r199373569
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -17,6 +17,7 @@
package org.apache.spark.sql.catalyst.expressions
import java.util.{Comparator, TimeZone}
+import java.util
--- End diff --
nit: Do we need this import?
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