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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