dongjoon-hyun commented on issue #25643: [SPARK-28939][SQL] Propagate SQLConf for plans executed by toRdd URL: https://github.com/apache/spark/pull/25643#issuecomment-529700086 This seems to be an old Scala bug on JDK9+. - https://github.com/scala/bug/issues/10418 ``` [ERROR] [Error] /Users/dongjoon/PRS/SPARK-JDK11-FIX/sql/core/src/main/scala/org/apache/spark/sql/execution/SQLExecutionRDD.scala:42: ambiguous reference to overloaded definition, both method putAll in class Properties of type (x$1: java.util.Map[_, _])Unit and method putAll in class Hashtable of type (x$1: java.util.Map[_ <: Object, _ <: Object])Unit match argument types (java.util.Map[String,String]) ```
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