[jira] [Commented] (DRILL-2118) Improve error message to inform the user if mappify/kvgen fails due to ClassCastException

["Hanifi Gunes (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-2118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297360#comment-14297360 ] 

Hanifi Gunes commented on DRILL-2118:
-------------------------------------

[~mehant] please review

> Improve error message to inform the user if mappify/kvgen fails due to ClassCastException
> -----------------------------------------------------------------------------------------
>
>                 Key: DRILL-2118
>                 URL: https://issues.apache.org/jira/browse/DRILL-2118
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: Hanifi Gunes
>            Assignee: Hanifi Gunes
>            Priority: Minor
>         Attachments: DRILL-2118.1.patch.txt
>
>
> Currently mappify throws a non-user friendly error message when the input map consists of heterogenous value types. The proposal is to improve the error message to inform user about the usage and root cause of the failure in a non-technical dialect.
> Running
> {code}
> select kvgen(t.m) from ex.json t
> {code}
> over
> {code:title=ex.json}
> {m:{a:1}}
> {m:{b:-1.0}}
> {code}
> throws 
> {code}
> Query failed: Query failed: Failure while running fragment., org.apache.drill.exec.vector.complex.impl.NullableFloat8WriterImpl cannot be cast to org.apache.drill.exec.vector.complex.impl.NullableIntWriterImpl
> {code}
> We should inform the user with an intelligible reason why the query failed instead.



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