Jesus Camacho Rodriguez created HIVE-24041:
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Summary: 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
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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