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https://issues.apache.org/jira/browse/DRILL-5534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16022649#comment-16022649
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Volodymyr Vysotskyi commented on DRILL-5534:
--------------------------------------------
This issue will be fixed within DRILL-4824.
> convert_from on a json map with null value produces an NPE
> ----------------------------------------------------------
>
> Key: DRILL-5534
> URL: https://issues.apache.org/jira/browse/DRILL-5534
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Affects Versions: 1.10.0
> Reporter: Rahul Challapalli
>
> git.commit.id.abbrev=d11aba2
> The below query fails with an NPE. Surprisingly there is information about
> the error in the logs
> {code}
> 0: jdbc:drill:zk=10.10.100.190:5181> select convert_from('{kpi : null}'
> ,'json') as kpi from cp.`tpch/lineitem.parquet` limit 1;
> Error: Unexpected RuntimeException: java.lang.NullPointerException
> (state=,code=0)
> {code}
> Adding one more column to the above query gets rid of the NPE
> {code}
> select '' as rk, convert_from('{kpi : null}' ,'json') as kpi from
> cp.`tpch/lineitem.parquet` limit 1;
> +-----+------+
> | rk | kpi |
> +-----+------+
> | | {} |
> +-----+------+
> 1 row selected (1.013 seconds)
> {code}
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