Examples with ProjectPushInfo org.apache.drill.exec.planner.physical.PrelUtil.ProjectPushInfo used on opensource projects

Example 1 with ProjectPushInfo

use of org.apache.drill.exec.planner.physical.PrelUtil.ProjectPushInfo in project drill by apache.

the class DrillPushProjIntoScan method onMatch.

@Override
public void onMatch(RelOptRuleCall call) {
    final Project proj = (Project) call.rel(0);
    final TableScan scan = (TableScan) call.rel(1);
    try {
        ProjectPushInfo columnInfo = PrelUtil.getColumns(scan.getRowType(), proj.getProjects());
        // get DrillTable, either wrapped in RelOptTable, or DrillTranslatableTable.
        DrillTable table = scan.getTable().unwrap(DrillTable.class);
        if (table == null) {
            table = scan.getTable().unwrap(DrillTranslatableTable.class).getDrillTable();
        }
        if (//
        columnInfo == null || columnInfo.isStarQuery() || !//
        table.getGroupScan().canPushdownProjects(columnInfo.columns)) {
            return;
        }
        final DrillScanRel newScan = new DrillScanRel(scan.getCluster(), scan.getTraitSet().plus(DrillRel.DRILL_LOGICAL), scan.getTable(), columnInfo.createNewRowType(proj.getInput().getCluster().getTypeFactory()), columnInfo.columns);
        List<RexNode> newProjects = Lists.newArrayList();
        for (RexNode n : proj.getChildExps()) {
            newProjects.add(n.accept(columnInfo.getInputRewriter()));
        }
        final DrillProjectRel newProj = new DrillProjectRel(proj.getCluster(), proj.getTraitSet().plus(DrillRel.DRILL_LOGICAL), newScan, newProjects, proj.getRowType());
        if (ProjectRemoveRule.isTrivial(newProj)) {
            call.transformTo(newScan);
        } else {
            call.transformTo(newProj);
        }
    } catch (IOException e) {
        throw new DrillRuntimeException(e);
    }
}