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https://issues.apache.org/jira/browse/DRILL-351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Nadeau updated DRILL-351:
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Component/s: Execution - Operators
> 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: Improvement
> Components: Execution - Operators
> Reporter: Aman Sinha
> Fix For: Future
>
>
> 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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