Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/719#issuecomment-137691470
When I submitted a query on HDFS table, the query is hanged with the
following error.
```
2015-09-04 18:36:30,726 INFO org.apache.tajo.storage.FileTablespace: Total
# of splits: 1
2015-09-04 18:36:30,727 ERROR org.apache.tajo.querymaster.Stage: Stage
(eb_1441359373738_0001_000007) ERROR:
java.lang.ClassCastException: org.apache.tajo.storage.pgsql.PgSQLTablespace
cannot be cast to org.apache.tajo.storage.FileTablespace
at
org.apache.tajo.querymaster.Repartitioner.scheduleLeafTasksWithBroadcastTable(Repartitioner.java:507)
at
org.apache.tajo.querymaster.Repartitioner.scheduleFragmentsForJoinQuery(Repartitioner.java:231)
at
org.apache.tajo.querymaster.Stage$InitAndRequestContainer.schedule(Stage.java:1037)
at
org.apache.tajo.querymaster.Stage$InitAndRequestContainer.access$800(Stage.java:817)
at
org.apache.tajo.querymaster.Stage$InitAndRequestContainer$1.run(Stage.java:843)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
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)
```
Query hang is because the type cast exception is not handled, so it may not
be related to this issue.
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