[jira] [Created] (TAJO-866) COUNT DISTINCT with other aggregation function throws ClassCastException.

["Hyoungjun Kim (JIRA)" <ji...@apache.org>]

Hyoungjun Kim created TAJO-866:
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             Summary: COUNT DISTINCT with other aggregation function throws ClassCastException.
                 Key: TAJO-866
                 URL: https://issues.apache.org/jira/browse/TAJO-866
             Project: Tajo
          Issue Type: Bug
            Reporter: Hyoungjun Kim
            Priority: Minor


I tested with the following data and query. 
{noformat}
default> select * from table1;
id,code,qty
-------------------------------
1,a,3
1,a,4
1,b,5
2,a,1
2,c,2
2,d,3

default> select id, count(distinct code), avg(qty) from table101 group by id;
2014-06-05 21:29:56,960 ERROR: org.apache.tajo.worker.Task (run(390)) - org.apache.tajo.datum.NullDatum cannot be cast to org.apache.tajo.datum.ProtobufDatum
java.lang.ClassCastException: org.apache.tajo.datum.NullDatum cannot be cast to org.apache.tajo.datum.ProtobufDatum
	at org.apache.tajo.engine.function.builtin.AvgLong.merge(AvgLong.java:66)
	at org.apache.tajo.engine.eval.AggregationFunctionCallEval.merge(AggregationFunctionCallEval.java:59)
	at org.apache.tajo.engine.planner.physical.SortAggregateExec.next(SortAggregateExec.java:77)
	at org.apache.tajo.engine.planner.physical.DistinctGroupbySortAggregationExec.next(DistinctGroupbySortAggregationExec.java:88)
	at org.apache.tajo.engine.planner.physical.StoreTableExec.next(StoreTableExec.java:77)
	at org.apache.tajo.worker.Task.run(Task.java:382)
	at org.apache.tajo.worker.TaskRunner$1.run(TaskRunner.java:406)
	at java.lang.Thread.run(Thread.java:744)
{noformat}





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