java.util.ConcurrentModificationException: mutation occurred during iteration
[info] at scala.collection.mutable.MutationTracker$.checkMutations(MutationTracker.scala:43)
[info] at scala.collection.mutable.CheckedIndexedSeqView$CheckedIterator.hasNext(CheckedIndexedSeqView.scala:47)
[info] at scala.collection.IterableOnceOps.addString(IterableOnce.scala:1247)
[info] at scala.collection.IterableOnceOps.addString$(IterableOnce.scala:1241)
[info] at scala.collection.AbstractIterable.addString(Iterable.scala:933)
[info] at scala.collection.IterableOnceOps.mkString(IterableOnce.scala:1191)
[info] at scala.collection.IterableOnceOps.mkString$(IterableOnce.scala:1189)
[info] at scala.collection.AbstractIterable.mkString(Iterable.scala:933)
[info] at scala.collection.IterableOnceOps.mkString(IterableOnce.scala:1204)
[info] at scala.collection.IterableOnceOps.mkString$(IterableOnce.scala:1204)
[info] at scala.collection.AbstractIterable.mkString(Iterable.scala:933)
[info] at org.apache.spark.sql.hive.thriftserver.CliSuite.runCliWithin(CliSuite.scala:205)
[info] at org.apache.spark.sql.hive.thriftserver.CliSuite.$anonfun$new$20(CliSuite.scala:501)