| /* |
| * 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.visitor; |
| |
| import java.util.List; |
| |
| import org.apache.drill.exec.planner.physical.Prel; |
| import org.apache.drill.exec.planner.physical.SelectionVectorRemoverPrel; |
| import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode; |
| import org.apache.calcite.rel.RelNode; |
| |
| import com.google.common.collect.Lists; |
| |
| |
| public class SelectionVectorPrelVisitor extends BasePrelVisitor<Prel, Void, RuntimeException>{ |
| |
| private static final SelectionVectorPrelVisitor INSTANCE = new SelectionVectorPrelVisitor(); |
| |
| public static Prel addSelectionRemoversWhereNecessary(Prel prel) { |
| return prel.accept(INSTANCE, null); |
| } |
| |
| @Override |
| public Prel visitPrel(Prel prel, Void value) throws RuntimeException { |
| SelectionVectorMode[] encodings = prel.getSupportedEncodings(); |
| List<RelNode> children = Lists.newArrayList(); |
| for (Prel child : prel) { |
| child = child.accept(this, null); |
| children.add(convert(encodings, child)); |
| } |
| |
| if (children.equals(prel.getInputs())) { |
| return prel; |
| } |
| return (Prel) prel.copy(prel.getTraitSet(), children); |
| } |
| |
| private Prel convert(SelectionVectorMode[] encodings, Prel prel) { |
| for (SelectionVectorMode m : encodings) { |
| if (prel.getEncoding() == m) { |
| return prel; |
| } |
| } |
| return new SelectionVectorRemoverPrel(prel); |
| } |
| |
| } |