ResetProjectionAttachedRelationalOpVisitor.java example

Explorer
spork-master
/*
 * 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.pig.newplan.logical.visitor;

import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.newplan.ReverseDependencyOrderWalker;
import org.apache.pig.newplan.logical.expression.LogicalExpression;
import org.apache.pig.newplan.logical.expression.LogicalExpressionPlan;
import org.apache.pig.newplan.logical.expression.LogicalExpressionVisitor;
import org.apache.pig.newplan.logical.expression.ProjectExpression;
import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator;

public class ResetProjectionAttachedRelationalOpVisitor
        extends LogicalExpressionVisitor {
    private LogicalRelationalOperator attachedRelationalOp;

    public ResetProjectionAttachedRelationalOpVisitor (
        LogicalExpressionPlan plan, LogicalRelationalOperator op )
        throws FrontendException {
        super(plan, new ReverseDependencyOrderWalker(plan));
        this.attachedRelationalOp = op;

    }

    @Override
    public void visit(ProjectExpression pe) throws FrontendException {
        pe.setAttachedRelationalOp(attachedRelationalOp);
    }
}