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From "Sean Hsuan-Yi Chu (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DRILL-2830) Self-Join via view gives wrong results
Date Thu, 02 Jul 2015 22:35:04 GMT

     [ https://issues.apache.org/jira/browse/DRILL-2830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Hsuan-Yi Chu resolved DRILL-2830.
--------------------------------------
    Resolution: Duplicate

> 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
>             Fix For: 1.2.0
>
>
> 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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