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  1. Apache Drill
  2. DRILL-491

Support project push-down into scan operator

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.4.0
    • Component/s: None
    • Labels:
      None

      Description

      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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              • Assignee:
                jni Jinfeng Ni
                Reporter:
                jni Jinfeng Ni
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                • Created:
                  Updated:
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