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https://issues.apache.org/jira/browse/DRILL-5263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Serhii Harnyk updated DRILL-5263:
---------------------------------
Description:
Nested loop join operator in Drill supports only inner join and returns
incorrect result for queries with left join. 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}
was:
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}
> 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. 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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