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https://issues.apache.org/jira/browse/HIVE-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898124#action_12898124
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Amareshwari Sriramadasu commented on HIVE-1534:
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With ppd on or off, Mapper is filtering out table with alias a on the predicate
a.key < 100 for the left outer join query. Similarly on alias b for right outer
join query. This is mostly because of HIVE-1538.
> predicate pushdown does not work correctly with outer joins
> -----------------------------------------------------------
>
> Key: HIVE-1534
> URL: https://issues.apache.org/jira/browse/HIVE-1534
> Project: Hadoop Hive
> Issue Type: Bug
> Components: Query Processor
> Reporter: Amareshwari Sriramadasu
> Assignee: Amareshwari Sriramadasu
>
> The hive documentation for predicate pushdown says:
> Left outer join: predicates on the left side aliases are pushed
> Right outer join: predicates on the right side aliases are pushed
> But, this pushdown should not happen for AND predicates in join queries:
> ex: SELECT * FROM T1 JOIN T2 ON (T1.c1=T2.c2 AND T1.c1 < 10)
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