HyukjinKwon commented on code in PR #43161:
URL: https://github.com/apache/spark/pull/43161#discussion_r1366445196


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala:
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@@ -175,30 +176,7 @@ abstract class TreeNode[BaseType <: TreeNode[BaseType]]
 
   lazy val height: Int = children.map(_.height).reduceOption(_ max 
_).getOrElse(0) + 1
 
-  // Copied from Scala 2.13.1
-  // 
github.com/scala/scala/blob/v2.13.1/src/library/scala/util/hashing/MurmurHash3.scala#L56-L73
-  // to prevent the issue https://github.com/scala/bug/issues/10495
-  // TODO(SPARK-30848): Remove this once we drop Scala 2.12.

Review Comment:
   You can use https://issues.apache.org/jira/browse/SPARK-30848 JIRA :-).



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