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* to you under the Apache License, Version 2.0 (the
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package org.apache.drill.exec.planner.physical;
import org.apache.drill.common.expression.LogicalExpression;
import org.apache.drill.common.expression.PathSegment;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.config.FlattenPOP;
import org.apache.drill.exec.planner.common.DrillFilterRelBase;
import org.apache.drill.exec.planner.logical.DrillOptiq;
import org.apache.drill.exec.planner.logical.DrillParseContext;
import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
import org.apache.drill.exec.record.BatchSchema;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.rex.RexNode;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
public class DrillFlattenPrel extends SinglePrel implements Prel {
RexNode toFlatten;
public DrillFlattenPrel(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexNode toFlatten) {
super(cluster, traits, child);
this.toFlatten = toFlatten;
}
@Override
public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
return new DrillFlattenPrel(getCluster(), traitSet, sole(inputs), toFlatten);
}
@Override
public Iterator<Prel> iterator() {
return PrelUtil.iter(getChild());
}
@Override
public PhysicalOperator getPhysicalOperator(PhysicalPlanCreator creator) throws IOException {
Prel child = (Prel) this.getChild();
PhysicalOperator childPOP = child.getPhysicalOperator(creator);
FlattenPOP f = new FlattenPOP(childPOP, (SchemaPath) getFlattenExpression(new DrillParseContext()));
return creator.addMetadata(this, f);
}
@Override
public BatchSchema.SelectionVectorMode getEncoding() {
return BatchSchema.SelectionVectorMode.NONE;
}
protected LogicalExpression getFlattenExpression(DrillParseContext context){
return DrillOptiq.toDrill(context, getChild(), toFlatten);
}
}