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https://issues.apache.org/jira/browse/DRILL-4783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386786#comment-15386786
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ASF GitHub Bot commented on DRILL-4783:
---------------------------------------
Github user chunhui-shi commented on the issue:
https://github.com/apache/drill/pull/546
Thanks @jaltekruse for the review. I updated exception text and added test
case following your suggestion.
> Flatten on CONVERT_FROM fails with ClassCastException if resultset is empty
> ---------------------------------------------------------------------------
>
> Key: DRILL-4783
> URL: https://issues.apache.org/jira/browse/DRILL-4783
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Chunhui Shi
> Assignee: Chunhui Shi
> Priority: Critical
>
> Flatten failed to work on top of convert_from when the resultset is empty.
> For a HBase table like this:
> 0: jdbc:drill:zk=localhost:5181> select convert_from(t.address.cities,'json')
> from hbase.`/tmp/flattentest` t;
> +----------------------------------------------------------------------------------+
> | EXPR$0
> |
> +----------------------------------------------------------------------------------+
> | {"list":[{"city":"SunnyVale"},{"city":"Palo Alto"},{"city":"Mountain
> View"}]} |
> | {"list":[{"city":"Seattle"},{"city":"Bellevue"},{"city":"Renton"}]}
> |
> | {"list":[{"city":"Minneapolis"},{"city":"Falcon Heights"},{"city":"San
> Paul"}]} |
> +----------------------------------------------------------------------------------+
> Flatten works when row_key is in (1,2,3)
> 0: jdbc:drill:zk=localhost:5181> select flatten(t1.json.list) from (select
> convert_from(t.address.cities,'json') json from hbase.`/tmp/flattentest` t
> where row_key=1) t1;
> +---------------------------+
> | EXPR$0 |
> +---------------------------+
> | {"city":"SunnyVale"} |
> | {"city":"Palo Alto"} |
> | {"city":"Mountain View"} |
> +---------------------------+
> But Flatten throws exception if the resultset is empty
> 0: jdbc:drill:zk=localhost:5181> select flatten(t1.json.list) from (select
> convert_from(t.address.cities,'json') json from hbase.`/tmp/flattentest` t
> where row_key=4) t1;
> Error: SYSTEM ERROR: ClassCastException: Cannot cast
> org.apache.drill.exec.vector.NullableIntVector to
> org.apache.drill.exec.vector.complex.RepeatedValueVector
> Fragment 0:0
> [Error Id: 07fd0cab-d1e6-4259-bfec-ad80f02d93a2 on atsqa4-127.qa.lab:31010]
> (state=,code=0)
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