content: /*
   * 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.calcite.adapter.pig;
  
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.core.Project;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rex.RexNode;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableSet;
  
  import java.util.List;
  
  /** Implementation of {@link org.apache.calcite.rel.core.Project} in
   * {@link PigRel#CONVENTION Pig calling convention}. */
  public class PigProject extends Project implements PigRel {
  
    /** Creates a PigProject. */
    public PigProject(RelOptCluster cluster, RelTraitSet traitSet, RelNode input,
        List<? extends RexNode> projects, RelDataType rowType) {
      super(cluster, traitSet, ImmutableList.of(), input, projects, rowType, ImmutableSet.of());
      assert getConvention() == PigRel.CONVENTION;
    }
  
    @Override public Project copy(RelTraitSet traitSet, RelNode input, List<RexNode> projects,
        RelDataType rowType) {
      return new PigProject(input.getCluster(), traitSet, input, projects, rowType);
    }
  
    @Override public void implement(Implementor implementor) {
      System.out.println(getTable());
    }
  
    /**
     * Override this method so it looks down the tree to find the table this node
     * is acting on.
     */
    @Override public RelOptTable getTable() {
      return getInput().getTable();
    }
  }
  