Boaz Ben-Zvi created DRILL-6758:
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Summary: Hash Join should not return the join columns when they
are not needed downstream
Key: DRILL-6758
URL: https://issues.apache.org/jira/browse/DRILL-6758
Project: Apache Drill
Issue Type: Improvement
Components: Execution - Relational Operators, Query Planning &
Optimization
Affects Versions: 1.14.0
Reporter: Boaz Ben-Zvi
Assignee: Hanumath Rao Maduri
Fix For: 1.15.0
Currently the Hash-Join operator returns all its (both sides) incoming columns.
In cases where the join columns are not used further downstream, this is a
waste (allocating vectors, copying each value, etc).
Suggestion: Have the planner pass this information to the Hash-Join operator,
to enable skipping the return of these columns.
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