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https://issues.apache.org/jira/browse/HIVE-17726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16205768#comment-16205768
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Peter Vary commented on HIVE-17726:
-----------------------------------
Thanks [~kgyrtkirk] for the investigation! :)
> Using exists may lead to incorrect results
> ------------------------------------------
>
> Key: HIVE-17726
> URL: https://issues.apache.org/jira/browse/HIVE-17726
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Zoltan Haindrich
> Assignee: Vineet Garg
> Attachments: HIVE-17726.1.patch, HIVE-17726.2.patch,
> HIVE-17726.3.patch
>
>
> {code}
> drop table if exists tx1;
> create table tx1 (a integer,b integer);
> insert into tx1 values (1, 1),
> (1, 2),
> (1, 3);
> select count(*) as result,3 as expected from tx1 u
> where exists (select * from tx1 v where u.a=v.a and u.b <> v.b);
> select count(*) as result,3 as expected from tx1 u
> where exists (select * from tx1 v where u.a=v.a and u.b <> v.b limit 1);
> {code}
> current results are 6 and 2.
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