[jira] [Created] (DRILL-2181) Throw proper error message when flatten is used within an 'order by' or 'group by'

["Rahul Challapalli (JIRA)" <ji...@apache.org>]

Rahul Challapalli created DRILL-2181:
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             Summary: Throw proper error message when flatten is used within an 'order by' or 'group by'
                 Key: DRILL-2181
                 URL: https://issues.apache.org/jira/browse/DRILL-2181
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Rahul Challapalli


git.commit.id.abbrev=c54bd6a

Flatten can be used within a group by or order by statement when the output of flatten is a scalar. However drill currently does not support using flatten with the above operators when its output is not a scalar. In such cases we should show a more appropriate error, possibly indicating how to correct the query as well

Currently this is what we get. This is obscure and does not pinpoint the issue
{code}
select * from `data1.json` order by flatten(events);
Query failed: RemoteRpcException: Failure while running fragment., org.apache.drill.exec.vector.NullableIntVector cannot be cast to org.apache.drill.exec.vector.RepeatedVector [ c3d85d23-7ea0-43ea-bbd3-ac18a0aa2de3 on qa-node191.qa.lab:31010 ]
[ c3d85d23-7ea0-43ea-bbd3-ac18a0aa2de3 on qa-node191.qa.lab:31010 ]


Error: exception while executing query: Failure while executing query. (state=,code=0)
{code}



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