HyukjinKwon commented on a change in pull request #29712:
URL: https://github.com/apache/spark/pull/29712#discussion_r486713438



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceUtils.scala
##########
@@ -190,4 +192,15 @@ object DataSourceUtils {
     case LegacyBehaviorPolicy.LEGACY => 
RebaseDateTime.rebaseGregorianToJulianMicros
     case LegacyBehaviorPolicy.CORRECTED => identity[Long]
   }
+
+  private[sql] def checkDuplicateOptions(

Review comment:
       We can remove `private[sql]` since execution package is already private 
(SPARK-16964)




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