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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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Status: Patch Available (was: Open)
> 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
>
> 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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