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https://issues.apache.org/jira/browse/HIVE-18173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-18173:
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Attachment: HIVE-18173.7.patch
> Improve plans for correlated subqueries with non-equi predicate
> ---------------------------------------------------------------
>
> Key: HIVE-18173
> URL: https://issues.apache.org/jira/browse/HIVE-18173
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Attachments: HIVE-18173.1.patch, HIVE-18173.2.patch,
> HIVE-18173.3.patch, HIVE-18173.4.patch, HIVE-18173.5.patch,
> HIVE-18173.6.patch, HIVE-18173.7.patch
>
>
> HIVE-17767 optimized plan to not generate value generator (i.e. an extra join
> with outer query to fetch correlated columns) for EQUAL and NOT EQUAL
> predicates e.g.
> {code:sql}
> select * from src b where b.key in (select key from src a where b.value <>
> a.value)
> {code}
> This should be improved and implemented for rest of the predicates e.g. LESS
> THAN etc
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