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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$$clean(ClosureCleaner.scala:294)	at org.apache.spark.util.ClosureCleaner$.clean(ClosureCleaner.scala:122)	at org.apache.spark.SparkContext.clean(SparkContext.scala:2055)	at org.apache.spark.rdd.RDD$$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$$execute$1$1.apply(DataFrame.scala:1499)	at org.apache.spark.sql.execution.SQLExecution$.withNewExecutionId(SQLExecution.scala:56)	at org.apache.spark.sql.DataFrame.withNewExecutionId(DataFrame.scala:2086)	at org.apache.spark.sql.DataFrame.org$apache$spark$sql$DataFrame$$execute$1(DataFrame.scala:1498)	at org.apache.spark.sql.DataFrame.org$apache$spark$sql$DataFrame$$collect(DataFrame.scala:1505)	at org.apache.spark.sql.DataFrame$$anonfun$head$1.apply(DataFrame.scala:1375)	at org.apache.spark.sql.DataFrame$$anonfun$head$1.apply(DataFrame.scala:1374)	at org.apache.spark.sql.DataFrame.withCallback(DataFrame.scala:2099)	at org.apache.spark.sql.DataFrame.head(DataFrame.scala:1374)	at org.apache.spark.sql.DataFrame.take(DataFrame.scala:1456)	at org.apache.spark.sql.DataFrame.showString(DataFrame.scala:170)	at org.apache.spark.sql.DataFrame.show(DataFrame.scala:350)	at org.apache.spark.sql.DataFrame.show(DataFrame.scala:311)	at org.apache.spark.sql.DataFrame.show(DataFrame.scala:319)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:33)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:38)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:40)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:42)	at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC.(:44)	at $iwC$$iwC$$iwC$$iwC$$iwC.(:46)	at $iwC$$iwC$$iwC$$iwC.(:48)	at $iwC$$iwC$$iwC.(:50)	at $iwC$$iwC.(:52)	at $iwC.(:54)