Gopal V created HIVE-18769:
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Summary: Vectorization: Disable vectorization of key-less outer
joins
Key: HIVE-18769
URL: https://issues.apache.org/jira/browse/HIVE-18769
Project: Hive
Issue Type: Bug
Components: Vectorization
Affects Versions: 3.0.0
Reporter: Gopal V
Left & Right outer joins without keys are valid in SQL and they have different
semantics from cross-products
{code}
create temporary table foo(x int) stored as orc;
insert into foo values(1),(2);
create temporary table bar(y int) stored as orc;
select count(*) from bar right outer join foo; -- = 2
select count(*) from bar, foo; -- = 0
{code}
canSpecializeMapJoin should bail on these cases.
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