[jira] [Comment Edited] (HIVE-18769) Vectorization: Disable vectorization of key-less outer joins

["Matt McCline (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-18769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372516#comment-16372516 ] 

Matt McCline edited comment on HIVE-18769 at 2/22/18 8:07 AM:
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NOTE: This patch does have a new Q file vector_outer_join_no_keys.q which is the query from the description but it needs tweaking so it demonstrates the problem.


was (Author: mmccline):
NOTE: This patch does not have a Q file that demonstrates the fix.

> 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
>
>
> 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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