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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.planner.physical;
import java.util.Iterator;
import java.util.List;
import org.apache.drill.exec.planner.common.DrillUnionRelBase;
import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
import org.apache.calcite.rel.InvalidRelException;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelTraitSet;
public abstract class UnionPrel extends DrillUnionRelBase implements Prel{
public UnionPrel(RelOptCluster cluster, RelTraitSet traits, List<RelNode> inputs, boolean all,
boolean checkCompatibility) throws InvalidRelException {
super(cluster, traits, inputs, all, checkCompatibility);
}
@Override
public <T, X, E extends Throwable> T accept(PrelVisitor<T, X, E> logicalVisitor, X value) throws E {
return logicalVisitor.visitPrel(this, value);
}
@Override
public Iterator<Prel> iterator() {
return PrelUtil.iter(this.getInputs());
}
@Override
public boolean needsFinalColumnReordering() {
return false;
}
@Override
public Prel addImplicitRowIDCol(List<RelNode> children) {
throw new UnsupportedOperationException("Adding Implicit RowID column is not supported for " +
this.getClass().getSimpleName() + " operator ");
}
}
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