flink-optimizer/src/main/java/org/apache/flink/optimizer/operators/HashLeftOuterJoinBuildSecondDescriptor.java

/*
 * 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.flink.optimizer.operators;

import org.apache.flink.api.common.operators.util.FieldList;
import org.apache.flink.optimizer.dag.TwoInputNode;
import org.apache.flink.optimizer.dataproperties.LocalProperties;
import org.apache.flink.optimizer.dataproperties.RequestedLocalProperties;
import org.apache.flink.optimizer.plan.Channel;
import org.apache.flink.optimizer.plan.DualInputPlanNode;
import org.apache.flink.runtime.operators.DriverStrategy;

import java.util.Collections;
import java.util.List;

public class HashLeftOuterJoinBuildSecondDescriptor extends AbstractJoinDescriptor {

    public HashLeftOuterJoinBuildSecondDescriptor(
            FieldList keys1,
            FieldList keys2,
            boolean broadcastSecondAllowed,
            boolean repartitionAllowed) {
        super(keys1, keys2, false, broadcastSecondAllowed, repartitionAllowed);
    }

    @Override
    public DriverStrategy getStrategy() {
        return DriverStrategy.LEFT_HYBRIDHASH_BUILD_SECOND;
    }

    @Override
    protected List<LocalPropertiesPair> createPossibleLocalProperties() {
        // all properties are possible
        return Collections.singletonList(
                new LocalPropertiesPair(
                        new RequestedLocalProperties(), new RequestedLocalProperties()));
    }

    @Override
    public boolean areCoFulfilled(
            RequestedLocalProperties requested1,
            RequestedLocalProperties requested2,
            LocalProperties produced1,
            LocalProperties produced2) {
        return true;
    }

    @Override
    public DualInputPlanNode instantiate(Channel in1, Channel in2, TwoInputNode node) {

        String nodeName = "LeftOuterJoin (" + node.getOperator().getName() + ")";
        return new DualInputPlanNode(
                node, nodeName, in1, in2, getStrategy(), this.keys1, this.keys2);
    }

    @Override
    public LocalProperties computeLocalProperties(LocalProperties in1, LocalProperties in2) {
        return new LocalProperties();
    }
}