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https://issues.apache.org/jira/browse/DRILL-2181?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Hsuan-Yi Chu resolved DRILL-2181.
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Resolution: Fixed
> 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
> Components: Query Planning & Optimization
> Reporter: Rahul Challapalli
> Assignee: Sean Hsuan-Yi Chu
> Fix For: 1.0.0
>
> Attachments: DRILL-2181.1.patch
>
>
> 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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