hsiang-c commented on PR #1987:
URL: 
https://github.com/apache/datafusion-comet/pull/1987#issuecomment-3075575929

   Most of the exceptions in Iceberg Spark SQL Tests can be reproduced by
   
   1. Follow the official guide to build Comet and Iceberg, configure Spark 
shell and populate the Iceberg table: 
https://datafusion.apache.org/comet/user-guide/iceberg.html
   2. Query Iceberg metadata tables with an operator. Here is an example:
   
   ```sql
   -- default is the catalog name used in local HadoopCatalog setup
   scala> spark.sql(s"SELECT COUNT(*) from default.t1.snapshots").show()
   
   25/07/15 13:06:16 ERROR Executor: Exception in task 0.0 in stage 2.0 (TID 2)
   java.lang.ClassCastException: class 
org.apache.iceberg.spark.source.StructInternalRow cannot be cast to class 
org.apache.spark.sql.vectorized.ColumnarBatch 
(org.apache.iceberg.spark.source.StructInternalRow is in unnamed module of 
loader scala.reflect.internal.util.ScalaClassLoader$URLClassLoader @19ac93d2; 
org.apache.spark.sql.vectorized.ColumnarBatch is in unnamed module of loader 
'app')
        at 
org.apache.spark.sql.comet.CometBatchScanExec$$anon$1.next(CometBatchScanExec.scala:68)
        at 
org.apache.spark.sql.comet.CometBatchScanExec$$anon$1.next(CometBatchScanExec.scala:57)
        at 
org.apache.comet.CometBatchIterator.hasNext(CometBatchIterator.java:51)
        at org.apache.comet.Native.executePlan(Native Method)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$2(CometExecIterator.scala:155)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$2$adapted(CometExecIterator.scala:154)
        at org.apache.comet.vector.NativeUtil.getNextBatch(NativeUtil.scala:157)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$1(CometExecIterator.scala:154)
        at org.apache.comet.Tracing$.withTrace(Tracing.scala:31)
        at 
org.apache.comet.CometExecIterator.getNextBatch(CometExecIterator.scala:152)
        at 
org.apache.comet.CometExecIterator.hasNext(CometExecIterator.scala:203)
        at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:460)
        at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:460)
        at 
org.apache.comet.CometBatchIterator.hasNext(CometBatchIterator.java:50)
        at org.apache.comet.Native.executePlan(Native Method)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$2(CometExecIterator.scala:155)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$2$adapted(CometExecIterator.scala:154)
        at org.apache.comet.vector.NativeUtil.getNextBatch(NativeUtil.scala:157)
        at 
org.apache.comet.CometExecIterator.$anonfun$getNextBatch$1(CometExecIterator.scala:154)
        at org.apache.comet.Tracing$.withTrace(Tracing.scala:31)
        at 
org.apache.comet.CometExecIterator.getNextBatch(CometExecIterator.scala:152)
        at 
org.apache.comet.CometExecIterator.hasNext(CometExecIterator.scala:203)
        at 
org.apache.spark.sql.comet.execution.shuffle.CometNativeShuffleWriter.write(CometNativeShuffleWriter.scala:106)
        at 
org.apache.spark.shuffle.ShuffleWriteProcessor.write(ShuffleWriteProcessor.scala:59)
        at 
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:104)
        at 
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:54)
        at 
org.apache.spark.TaskContext.runTaskWithListeners(TaskContext.scala:166)
        at org.apache.spark.scheduler.Task.run(Task.scala:141)
        at 
org.apache.spark.executor.Executor$TaskRunner.$anonfun$run$4(Executor.scala:620)
        at 
org.apache.spark.util.SparkErrorUtils.tryWithSafeFinally(SparkErrorUtils.scala:64)
        at 
org.apache.spark.util.SparkErrorUtils.tryWithSafeFinally$(SparkErrorUtils.scala:61)
        at org.apache.spark.util.Utils$.tryWithSafeFinally(Utils.scala:94)
        at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:623)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at java.base/java.lang.Thread.run(Thread.java:840)
   ```


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