Maksym Rymar created DRILL-8513:
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Summary: 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
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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