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https://issues.apache.org/jira/browse/DRILL-5263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868199#comment-15868199
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Serhii Harnyk commented on DRILL-5263:
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Before this changes allowed only left and inner NLJoins.
> 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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