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https://issues.apache.org/jira/browse/HIVE-18769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline updated HIVE-18769:
--------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
> 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
> Assignee: Matt McCline
> Priority: Major
> Attachments: HIVE-18769.01.patch, HIVE-18769.02.patch
>
>
> 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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