Jinfeng Ni created DRILL-491:
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Summary: 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
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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