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