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https://issues.apache.org/jira/browse/DRILL-491?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Nadeau resolved DRILL-491.
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Resolution: Fixed
merged in a3d1472
> Support project push-down into scan operator
> --------------------------------------------
>
> Key: DRILL-491
> URL: https://issues.apache.org/jira/browse/DRILL-491
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Attachments: DRILL-491.3.patch
>
>
> Currently, the scan operator will read all the columns from the data source,
> and pass all the columns to down-stream operator.
> In order to improve performance of Drill query, we should instead push the
> project operation into scan operator. The scan operator will take as an
> input a list of columns required to retrieve. If the query only refers a
> subset of columns, the scan operator will only have to retrieve values for
> the column in the list.
> It's expected to see performance improvement once project push-down is
> supported.
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