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From "Serhii Harnyk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-5263) Prevent left nested loop join
Date Wed, 15 Feb 2017 15:52:41 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Serhii Harnyk updated DRILL-5263:
---------------------------------
    Summary: Prevent left nested loop join  (was: Prevent left NLJoin with non scalar subqueries)

> Prevent left nested loop join
> -----------------------------
>
>                 Key: DRILL-5263
>                 URL: https://issues.apache.org/jira/browse/DRILL-5263
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Serhii Harnyk
>            Assignee: Serhii Harnyk
>         Attachments: tmp.tar.gz
>
>
> Nested loop join operator in Drill supports only inner join and returns incorrect result
for queries with left join and non scalar sub-queries. Drill should throw error in this case.
> Example:
> {code:sql}
> alter session set planner.enable_nljoin_for_scalar_only=false;
> select t2.dt, t1.fyq, t2.who, t2.event
> from t2
> left join t1 on t2.dt between t1.dts and t1.dte
> order by t2.dt;
> {code}
> Result:
> {noformat}
> +-------------+----------+----------+--------------------+
> |     dt      |   fyq    |   who    |       event        |
> +-------------+----------+----------+--------------------+
> | 2016-12-26  | 2016-Q2  | aperson  | had chrsitmas      |
> | 2017-01-06  | 2016-Q3  | aperson  | did somthing       |
> | 2017-01-12  | 2016-Q3  | aperson  | did somthing else  |
> +-------------+----------+----------+--------------------+
> {noformat}



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