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.rel.logical;
  
  import org.apache.calcite.plan.Convention;
  import org.apache.calcite.plan.RelOptCluster;
  import org.apache.calcite.plan.RelTraitSet;
  import org.apache.calcite.rel.RelCollation;
  import org.apache.calcite.rel.RelCollationTraitDef;
  import org.apache.calcite.rel.RelDistribution;
  import org.apache.calcite.rel.RelDistributionTraitDef;
  import org.apache.calcite.rel.RelInput;
  import org.apache.calcite.rel.RelNode;
  import org.apache.calcite.rel.core.SortExchange;
  
  /**
   * Sub-class of {@link org.apache.calcite.rel.core.SortExchange} not
   * targeted at any particular engine or calling convention.
   */
  public class LogicalSortExchange extends SortExchange {
    private LogicalSortExchange(RelOptCluster cluster, RelTraitSet traitSet,
        RelNode input, RelDistribution distribution, RelCollation collation) {
      super(cluster, traitSet, input, distribution, collation);
    }
  
    /**
     * Creates a LogicalSortExchange by parsing serialized output.
     */
    public LogicalSortExchange(RelInput input) {
      super(input);
    }
  
    /**
     * Creates a LogicalSortExchange.
     *
     * @param input     Input relational expression
     * @param distribution Distribution specification
     * @param collation array of sort specifications
     */
    public static LogicalSortExchange create(
        RelNode input,
        RelDistribution distribution,
        RelCollation collation) {
      RelOptCluster cluster = input.getCluster();
      collation = RelCollationTraitDef.INSTANCE.canonize(collation);
      distribution = RelDistributionTraitDef.INSTANCE.canonize(distribution);
      RelTraitSet traitSet =
          input.getTraitSet().replace(Convention.NONE).replace(distribution).replace(collation);
      return new LogicalSortExchange(cluster, traitSet, input, distribution,
          collation);
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public SortExchange copy(RelTraitSet traitSet, RelNode newInput,
        RelDistribution newDistribution, RelCollation newCollation) {
      return new LogicalSortExchange(this.getCluster(), traitSet, newInput,
          newDistribution, newCollation);
    }
  }
  