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https://issues.apache.org/jira/browse/DRILL-8513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17889207#comment-17889207
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ASF GitHub Bot commented on DRILL-8513:
---------------------------------------
rymarm opened a new pull request, #2952:
URL: https://github.com/apache/drill/pull/2952
# [DRILL-8513](https://issues.apache.org/jira/browse/DRILL-8513): Right Hash
Join with empty Left table ruturns 0 result
## Description
Drill returns no results on the right Hash Join if the probe(left) table is
empty.
The root cause is simple. Stack-trace of the point of failure:
```
changeToFinalProbeState:123, HashJoinProbeTemplate
(org.apache.drill.exec.physical.impl.join)
setup:105, ProbeTemplate (org.apache.drill.exec.physical.impl.join) <--
> 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
>
> Drill returns no results on the right Hash Join if the probe(left) table is
> empty.
> The simplest way to reproduce the issue:
> # 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}
> # Disable join order optimization to prevent Drill from flipping join tables:
> {code:java}
> alter session set planner.enable_join_optimization = false; {code}
> # 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}
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