[jira] [Created] (DRILL-1169) Simple UNION query fails

["Bob Rumsby (JIRA)" <ji...@apache.org>]

Bob Rumsby created DRILL-1169:
---------------------------------

             Summary: Simple UNION query fails
                 Key: DRILL-1169
                 URL: https://issues.apache.org/jira/browse/DRILL-1169
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
         Environment: Running Drill on MacOSX standalone.
#Sun Jul 20 20:12:53 PDT 2014
git.commit.id.abbrev=e5c2da0
            Reporter: Bob Rumsby


A query that selects a compatible column from the same JSON file on either side of the UNION operator fails. The same query works if UNION ALL is used. 

Example of Failure:
0: jdbc:drill:zk=local> select id from dfs.`/Users/brumsby/drill/donuts.json` union select id from dfs.`/Users/brumsby/drill/donuts.json`;
Query failed: org.apache.drill.exec.rpc.RpcException: Remote failure while running query.[error_id: "dfe76b6b-7eb0-49ee-8084-1e29ea995be0"
endpoint {
  address: "10.250.0.28"
  user_port: 31010
  control_port: 31011
  data_port: 31012
}
error_type: 0
message: "Failure while parsing sql. < CannotPlanException:[ Node [rel#880:Subset#6.PHYSICAL.SINGLETON([]).[]] could not be implemented; planner state:
...

Same query with UNION ALL (which works):

0: jdbc:drill:zk=local> select id from dfs.`/Users/brumsby/drill/donuts.json` union all select id from dfs.`/Users/brumsby/drill/donuts.json`;
+------------+
|     id     |
+------------+
| 0001       |
| 0001       |
+------------+
2 rows selected (0.111 seconds)



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