org.apache.tajo.plan.logical.JoinNode.java Source code

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Here is the source code for org.apache.tajo.plan.logical.JoinNode.java

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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.tajo.plan.logical;

import com.google.gson.annotations.Expose;
import org.apache.commons.lang.StringUtils;
import org.apache.tajo.algebra.JoinType;
import org.apache.tajo.plan.PlanString;
import org.apache.tajo.plan.Target;
import org.apache.tajo.plan.expr.EvalNode;
import org.apache.tajo.plan.util.PlannerUtil;
import org.apache.tajo.util.TUtil;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class JoinNode extends BinaryNode implements Projectable, Cloneable {
    @Expose
    private JoinSpec joinSpec = new JoinSpec();
    @Expose
    private List<Target> targets = null;

    public JoinNode(int pid) {
        super(pid, NodeType.JOIN);
    }

    public void init(JoinType joinType, LogicalNode left, LogicalNode right) {
        this.joinSpec.setType(joinType);
        setLeftChild(left);
        setRightChild(right);
    }

    public JoinType getJoinType() {
        return this.joinSpec.getType();
    }

    public JoinSpec getJoinSpec() {
        return joinSpec;
    }

    public void setJoinType(JoinType joinType) {
        this.joinSpec.setType(joinType);
    }

    public void setJoinQual(EvalNode joinQual) {
        this.joinSpec.setSingletonPredicate(joinQual);
    }

    public void clearJoinQual() {
        this.joinSpec.setPredicates(null);
    }

    public boolean hasJoinQual() {
        return this.joinSpec.hasPredicates();
    }

    public EvalNode getJoinQual() {
        return this.joinSpec.getSingletonPredicate();
    }

    @Override
    public boolean hasTargets() {
        return this.targets != null;
    }

    @Override
    public List<Target> getTargets() {
        return this.targets;
    }

    @Override
    public void setTargets(List<Target> targets) {
        this.targets = targets;
        this.setOutSchema(PlannerUtil.targetToSchema(targets));
    }

    @Override
    public PlanString getPlanString() {
        PlanString planStr = new PlanString(this).appendTitle("(").appendTitle(joinSpec.getType().name())
                .appendTitle(")");
        if (hasJoinQual()) {
            planStr.addExplan("Join Cond: " + joinSpec.getSingletonPredicate().toString());
        }

        if (hasTargets()) {
            planStr.addExplan("target list: ").appendExplain(StringUtils.join(targets, ", "));
        }

        planStr.addDetail("out schema: " + getOutSchema());
        planStr.addDetail("in schema: " + getInSchema());

        return planStr;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + joinSpec.hashCode();
        result = prime * result + Objects.hashCode(targets);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof JoinNode) {
            JoinNode other = (JoinNode) obj;
            boolean eq = this.joinSpec.equals(other.joinSpec);
            eq &= TUtil.checkEquals(this.targets, other.targets);
            return eq && leftChild.equals(other.leftChild) && rightChild.equals(other.rightChild);
        } else {
            return false;
        }
    }

    @Override
    public Object clone() throws CloneNotSupportedException {
        JoinNode join = (JoinNode) super.clone();
        join.joinSpec = (JoinSpec) this.joinSpec.clone();
        if (hasTargets()) {
            join.targets = new ArrayList<>();
            for (Target t : targets) {
                join.targets.add((Target) t.clone());
            }
        }
        return join;
    }

    public String toString() {
        StringBuilder sb = new StringBuilder("Join (type").append(joinSpec.getType());
        if (hasJoinQual()) {
            sb.append(",filter=").append(joinSpec.getSingletonPredicate());
        }
        sb.append(")");
        return sb.toString();
    }
}