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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