Aman Sinha created DRILL-351:
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Summary: MergeJoin physical operator projects columns that may not
be needed
Key: DRILL-351
URL: https://issues.apache.org/jira/browse/DRILL-351
Project: Apache Drill
Issue Type: Bug
Reporter: Aman Sinha
The MergeJoin physical operator currently projects all columns from the left
and right inputs with the assumption that a subsequent Project will drop the
unnecessary columns. This is sub-optimal because we incur the memory and cpu
overhead of populating the output record batch value vectors for those columns.
Ideally, the operator could keep track of the columns that are needed by the
parent (downstream) operator and only project those columns.
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