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

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

Hanifi Gunes created DRILL-2118:
-----------------------------------

             Summary: 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


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 query failed instead.



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