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java.lang.IllegalArgumentException: The requested
column (4)  is null	at org.kududb.client.RowResult.checkNull(RowResult.java:475)	at org.kududb.client.RowResult.getString(RowResult.java:321)	at org.kududb.client.RowResult.getString(RowResult.java:308)	at org.kududb.spark.KuduRelation.org$kududb$spark$KuduRelation$$getKuduValue(DefaultSource.scala:144)	at org.kududb.spark.KuduRelation$$anonfun$buildScan$1$$anonfun$apply$1.apply(DefaultSource.scala:126)	at org.kududb.spark.KuduRelation$$anonfun$buildScan$1$$anonfun$apply$1.apply(DefaultSource.scala:126)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)	at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)	at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:108)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)	at scala.collection.mutable.ArrayOps$ofRef.map(ArrayOps.scala:108)	at org.kududb.spark.KuduRelation$$anonfun$buildScan$1.apply(DefaultSource.scala:126)	at org.kududb.spark.KuduRelation$$anonfun$buildScan$1.apply(DefaultSource.scala:124)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)	at scala.collection.Iterator$$anon$10.next(Iterator.scala:312)	at scala.collection.Iterator$class.foreach(Iterator.scala:727)	at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)	at scala.collection.generic.Growable$class.$plus$plus$eq(Growable.scala:48)	at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:103)	at scala.collection.mutable.ArrayBuffer.$plus$plus$eq(ArrayBuffer.scala:47)	at scala.collection.TraversableOnce$class.to(TraversableOnce.scala:273)	at scala.collection.AbstractIterator.to(Iterator.scala:1157)	at scala.collection.TraversableOnce$class.toBuffer(TraversableOnce.scala:265)	at scala.collection.AbstractIterator.toBuffer(Iterator.scala:1157)	at scala.collection.TraversableOnce$class.toArray(TraversableOnce.scala:252)	at scala.collection.AbstractIterator.toArray(Iterator.scala:1157)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$5.apply(SparkPlan.scala:215)	at org.apache.spark.sql.execution.SparkPlan$$anonfun$5.apply(SparkPlan.scala:215)	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1850)	at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:1850)	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)	at org.apache.spark.scheduler.Task.run(Task.scala:88)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)