[jira] [Resolved] (DRILL-2271) count(distinct ) against SystemTablePlugin will hit plan serialization/deserialization issue when executed in distributed mode.

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-2271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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