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org.apache.spark.SparkException: Task not serializable	at org.apache.spark.util.ClosureCleaner$.ensureSerializable(ClosureCleaner.scala:304)	at org.apache.spark.util.ClosureCleaner$.org$apache$spark$util$ClosureCleaner$$clean(ClosureCleaner.scala:294)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:122)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2060)	at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1.apply(RDD.scala:707)	at org.apache.spark.rdd.RDD$$anonfun$mapPartitions$1.apply(RDD.scala:706)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:111)	at org.apache.spark.rdd.RDD.withScope(RDD.scala:316)	at org.apache.spark.rdd.RDD.mapPartitions(RDD.scala:706)	at org.apache.spark.sql.execution.ConvertToSafe.doExecute(rowFormatConverters.scala:56)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:132)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$execute$5.apply(SparkPlan.scala:130)	at org.apache.spark.rdd.RDDOperationScope$.withScope(RDDOperationScope.scala:150)	at org.apache.spark.sql.execution.SparkPlan.execute(SparkPlan.scala:130)	at org.apache.spark.sql.execution.SparkPlan.executeTake(SparkPlan.scala:187)	at org.apache.spark.sql.execution.Limit.executeCollect(basicOperators.scala:165)	at org.apache.spark.sql.execution.SparkPlan.executeCollectPublic(SparkPlan.scala:174)	at org.apache.spark.sql.DataFrame$$anonfun$org$apache$spark$sql$DataFrame$$execute$1$1.apply(DataFrame.scala:1499)	at org.apache.spark.sql.DataFrame$$anonfun$org$apache$spark$sql$DataFrame$$execute$1$1.apply(DataFrame.scala:1499)	at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:56)