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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2017/11/29 06:51:00 UTC
[jira] [Updated] (HIVE-18173) Improve plans for correlated
subqueries with non-equi predicate
[ https://issues.apache.org/jira/browse/HIVE-18173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vineet Garg updated HIVE-18173:
-------------------------------
Attachment: HIVE-18173.1.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-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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