I have a dataframe. I register it as a temp table and run a spark sql query
on it to get another dataframe. Now when I run groupBy on it, it gives me
this exception
e: Lost task 1.3 in stage 21.0 (TID 579, 172.28.0.162):
java.lang.ClassCastException: java.lang.String cannot be cast to
org.apache.spark.sql.types.UTF8String
at
org.apache.spark.sql.execution.SparkSqlSerializer2$$anonfun$createSerializationFunction$1.apply(SparkSqlSerializer2.scala:319)
at
org.apache.spark.sql.execution.SparkSqlSerializer2$$anonfun$createSerializationFunction$1.apply(SparkSqlSerializer2.scala:212)
at
org.apache.spark.sql.execution.Serializer2SerializationStream.writeKey(SparkSqlSerializer2.scala:65)
at
org.apache.spark.storage.DiskBlockObjectWriter.write(BlockObjectWriter.scala:206)
at
org.apache.spark.util.collection.WritablePartitionedIterator$$anon$3.writeNext(WritablePartitionedPairCollection.scala:104)
at
org.apache.spark.util.collection.ExternalSorter.spillToPartitionFiles(ExternalSorter.scala:375)
at
org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:208)
at
org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:62)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:70)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:70)
at
org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
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