fields are never queried, why?

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fields are never queried, why?

https://github.com/apache/incubator-wayang/blob/3fa657bcc8c86198b9532aa06bf27964c3f771be/wayang-api/wayang-api-sql/src/main/java/org/apache/wayang/api/sql/calcite/rel/WayangTableScan.java#L35

import org.apache.calcite.rel.hint.RelHint;
import org.apache.calcite.schema.Table;
import org.apache.wayang.api.sql.calcite.convention.WayangConvention;

import java.util.List;

public class WayangTableScan extends TableScan implements WayangRel {

    //TODO: fields are never queried, why?
    private final int[] fields;

    public WayangTableScan(RelOptCluster cluster,

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