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https://issues.apache.org/jira/browse/HIVE-24041?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez updated HIVE-24041:
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Fix Version/s: 4.0.0
Resolution: Fixed
Status: Resolved (was: Patch Available)
Pushed to master.
> Extend semijoin conversion rules
> --------------------------------
>
> Key: HIVE-24041
> URL: https://issues.apache.org/jira/browse/HIVE-24041
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> This patch fixes a couple of limitations that can be seen in
> {{cbo_query95.q}}, in particular:
> - It adds a rule to trigger semijoin conversion when the there is an
> aggregate on top of the join that prunes all columns from left side, and the
> aggregate operator is on the left input of the join.
> - It extends existing semijoin conversion rules to prune the unused columns
> from its left input, which leads to additional conversion opportunities.
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