Jinfeng Ni created DRILL-2271:
---------------------------------
Summary: 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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