Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/17527#discussion_r110392436 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/CaseInsensitiveMap.scala --- @@ -26,11 +28,12 @@ package org.apache.spark.sql.catalyst.util class CaseInsensitiveMap[T] private (val originalMap: Map[String, T]) extends Map[String, T] with Serializable { - val keyLowerCasedMap = originalMap.map(kv => kv.copy(_1 = kv._1.toLowerCase)) + val keyLowerCasedMap = originalMap.map(kv => kv.copy(_1 = kv._1.toLowerCase(Locale.ROOT))) --- End diff -- Really, it sounds nitpicking though.
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