[jira] [Created] (DRILL-1986) Natural join query returns wrong result

["Victoria Markman (JIRA)" <ji...@apache.org>]

Victoria Markman created DRILL-1986:
---------------------------------------

             Summary: Natural join query returns wrong result
                 Key: DRILL-1986
                 URL: https://issues.apache.org/jira/browse/DRILL-1986
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
    Affects Versions: 0.8.0
            Reporter: Victoria Markman
            Assignee: Jinfeng Ni


Natural join returns wrong result:

{code}
0: jdbc:drill:schema=dfs> select * from `t1.json`;
+------------+------------+------------+
|     a1     |     b1     |     c1     |
+------------+------------+------------+
| 1          | 1          | 2015-01-01 |
| 2          | 2          | 2015-01-02 |
+------------+------------+------------+
2 rows selected (0.087 seconds)

0: jdbc:drill:schema=dfs> select * from `t2.json`;
+------------+------------+------------+
|     a1     |     b1     |     c1     |
+------------+------------+------------+
| 1          | 1          | 2015-01-01 |
+------------+------------+------------+
1 row selected (0.112 seconds)

0: jdbc:drill:schema=dfs> select * from `t1.json` natural join `t2.json`;
+------------+------------+------------+------------+------------+------------+
|     a1     |     b1     |     c1     |    a10     |    b10     |    c10     |
+------------+------------+------------+------------+------------+------------+
+------------+------------+------------+------------+------------+------------+
No rows selected (0.223 seconds)
{code}


Equivalent inner join query returns one row:

{code}
0: jdbc:drill:schema=dfs> select * from `t1.json` t1, `t2.json` t2 where t1.a1=t2.a1 and t1.b1=t2.b1 and t1.c1=t2.c1;
+------------+------------+------------+------------+------------+------------+
|     a1     |     b1     |     c1     |    a10     |    b10     |    c10     |
+------------+------------+------------+------------+------------+------------+
| 1          | 1          | 2015-01-01 | 1          | 1          | 2015-01-01 |
+------------+------------+------------+------------+------------+------------+
1 row selected (0.732 seconds)
{code}

It listed as supported in our documentation. 
If we decide not to support it, we need to make sure to remove it from docs as well.




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