Sean Hsuan-Yi Chu created DRILL-2830:
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Summary: Self-Join via view gives wrong results
Key: DRILL-2830
URL: https://issues.apache.org/jira/browse/DRILL-2830
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Reporter: Sean Hsuan-Yi Chu
Assignee: Sean Hsuan-Yi Chu
Priority: Critical
Create a view by:
{code}
create view v1(x, y) as select n_regionkey, n_nationkey from
cp.`tpch/nation.parquet`;
{code}
And join this view with the file which created the view with condition
t.n_nationkey = v1.y (where 'y' is n_nationkey)
{code}
select t.n_nationkey from cp.`tpch/nation.parquet` t inner join v1 on
t.n_nationkey = v1.y;
{code}
+-------------+
| n_nationkey |
+-------------+
| 0 |
| 1 |
| 1 |
| 1 |
| 4 |
| 0 |
| 3 |
| 3 |
| 2 |
| 2 |
| 4 |
| 4 |
| 2 |
| 4 |
| 0 |
| 0 |
| 0 |
| 1 |
| 2 |
| 3 |
| 4 |
| 2 |
| 3 |
| 3 |
| 1 |
+-------------+
25 rows selected (0.153 seconds)
After investigating the plan, I found out that the result was produced as if
the join condition was t.n_nationkey = v1.x (where x is 'n_regionkey')
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