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https://issues.apache.org/jira/browse/DRILL-2271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinfeng Ni resolved DRILL-2271.
-------------------------------
Resolution: Duplicate
> count(distinct ) against SystemTablePlugin will hit plan
> serialization/deserialization issue when executed in distributed mode.
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-2271
> URL: https://issues.apache.org/jira/browse/DRILL-2271
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Priority: Minor
>
> The following query run fine in single node.
> {code}
> select count(distinct name) as cnt from `sys`.`options`;
> {code}
> However, if change the slice_target =1 and make it run in distributed mode,
> it hit error :
> {code}
> alter session set `planner.slice_target` = 1;
> +------------+------------+
> | ok | summary |
> +------------+------------+
> | true | planner.slice_target updated. |
> +------------+------------+
> select count(distinct name) as cnt from `sys`.`options`;
> Query failed: RemoteRpcException: Failure while trying to start remote
> fragment, No suitable constructor found for type [simple type, class
> org.apache.drill.exec.store.sys.SystemTablePlugin]: can not instantiate from
> JSON object (need to add/enable type information?)
> {code}
> Seems the serialization/deserialization of the plan for SystemTablePlugin
> does not work correctly.
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