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https://issues.apache.org/jira/browse/DRILL-8513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Turton closed DRILL-8513.
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> Right Hash Join with empty Left table ruturns 0 result
> ------------------------------------------------------
>
> Key: DRILL-8513
> URL: https://issues.apache.org/jira/browse/DRILL-8513
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Maksym Rymar
> Assignee: Maksym Rymar
> Priority: Major
> Fix For: 1.22.0
>
>
> Drill returns no results on the right Hash Join if the probe(left) table is
> empty.
> The simplest way to reproduce the issue:
> 1.To force Drill not to use merge join and use the hash join operator instead:
> {code:java}
> alter session set planner.enable_mergejoin = false;
> alter session set planner.enable_nestedloopjoin= false; {code}
> 2. Disable join order optimization to prevent Drill from flipping join tables:
> {code:java}
> alter session set planner.enable_join_optimization = false; {code}
> 3. Execute a query with empty left table outcome:
> {code:java}
> SELECT *
> FROM
> (SELECT * FROM (VALUES (1, 'Max', 28),
> (2, 'Jane', 32),
> (3, 'Saymon', 29)
> ) AS users(id, name, age)
> WHERE false
> ) AS users
> RIGHT JOIN
> (VALUES (1, 'Engineer'),
> (2, 'Doctor'),
> (3, 'Teacher')
> ) AS job(id, title)
> ON users.id = job.id {code}
> Expected result is:
> ||id||name||age||id0||title||
> |null|null|null|1|Engineer|
> |null|null|null|2|Doctor|
> |null|null|null|3|Teacher|
> But we get 0 rows.
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