Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/22553#discussion_r220770316 --- 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))) + new CaseInsensitiveMap(originalMap.filter(!_._1.equalsIgnoreCase(key))) + } + + override def filterKeys(p: (String) => Boolean): Map[String, T] = { --- End diff -- It seems safer to override the method though.. Anyway I will change all the methods calls of `filterKeys ` and add comment in `CaseInsensitiveMap`.
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