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Job aborted due to stage failure: Task 2 in stage 68.0 failed 4 times, most recent failure: Lost task 2.3 in stage 68.0 (TID 352, solrmain): java.lang.NullPointerException
org.apache.spark.SparkException: Job aborted due to stage failure: Task 2 in stage 68.0 failed 4 times, most recent failure: Lost task 2.3 in stage 68.0 (TID 352, solrmain): java.lang.NullPointerException	at org.apache.spark.api.python.SerDeUtil$$anonfun$toJavaArray$1.apply(SerDeUtil.scala:102)	at scala.collection.Iterator$$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$$anon$11.next(Iterator.scala:328)	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.processCurrentSortedGroup(SortBasedAggregationIterator.scala:122)	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.next(SortBasedAggregationIterator.scala:152)	at org.apache.spark.sql.execution.aggregate.SortBasedAggregationIterator.next(SortBasedAggregationIterator.scala:29)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)	at scala.collection.Iterator$$anon$11.next(Iterator.scala:328)	at org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:149)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:73)	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)	at org.apache.spark.scheduler.Task.run(Task.scala:89)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:227)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)