Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22553#discussion_r220463389 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/CaseInsensitiveMap.scala --- @@ -42,7 +42,11 @@ class CaseInsensitiveMap[T] private (val originalMap: Map[String, T]) extends Ma override def iterator: Iterator[(String, T)] = keyLowerCasedMap.iterator override def -(key: String): Map[String, T] = { - new CaseInsensitiveMap(originalMap.filterKeys(!_.equalsIgnoreCase(key))) --- End diff -- since we override `filterKeys`, do we still need to change here?
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