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.plan;
  
  /**
   * Cost model for query planning.
   */
  public interface RelOptCostFactory {
    /**
     * Creates a cost object.
     */
    RelOptCost makeCost(double rowCount, double cpu, double io);
  
    /**
     * Creates a cost object representing an enormous non-infinite cost.
     */
    RelOptCost makeHugeCost();
  
    /**
     * Creates a cost object representing infinite cost.
     */
    RelOptCost makeInfiniteCost();
  
    /**
     * Creates a cost object representing a small positive cost.
     */
    RelOptCost makeTinyCost();
  
    /**
     * Creates a cost object representing zero cost.
     */
    RelOptCost makeZeroCost();
  }
  