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.asterix.optimizer.rules.cbo;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalVariable;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.SelectOperator;
  
  public class JoinCondition {
  
      protected static final int NO_JC = -1;
  
      protected ILogicalExpression joinCondition;
      protected boolean outerJoin;
      protected boolean derived = false;
      protected boolean partOfComposite = false;
      protected boolean deleted = false;
      protected int numberOfVars = 0; // how many variables
      protected int componentNumber = 0; // for identifying if join graph is connected
      protected int datasetBits;
      // used for triangle detection; we strictly do not mean left and right here.
      // first and second sides would be more appropriate
      protected int leftSide;
      protected int rightSide;
      protected int leftSideBits;
      protected int rightSideBits;
      protected int numLeafInputs;
      protected double selectivity = -1.0; // This must be changed obviously
      protected comparisonOp comparisonType;
      protected JoinOperator joinOp = null;
      protected List<LogicalVariable> usedVars = null;
      protected List<SelectOperator> derivedSelOps = new ArrayList<>(); // only one of them will be regarded as original
  
      protected enum comparisonOp {
          OP_EQ,
          OP_OTHER
      }
  
      protected ILogicalExpression getJoinCondition() {
          return joinCondition;
      }
  }
  