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;
  
  import java.util.List;
  
  import org.apache.asterix.optimizer.base.AnalysisUtil;
  import org.apache.commons.lang3.mutable.Mutable;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
  import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
  import org.apache.hyracks.algebricks.core.algebra.base.LogicalOperatorTag;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.AbstractLogicalOperator;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.OrderOperator;
  import org.apache.hyracks.algebricks.core.algebra.operators.logical.OrderOperator.IOrder;
  import org.apache.hyracks.algebricks.rewriter.rules.AbstractExtractExprRule;
  
  public class ExtractOrderExpressionsRule extends AbstractExtractExprRule {
  
      @Override
      public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context) {
          return false;
      }
  
      @Override
      public boolean rewritePost(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
              throws AlgebricksException {
  
          AbstractLogicalOperator op1 = (AbstractLogicalOperator) opRef.getValue();
          if (op1.getOperatorTag() != LogicalOperatorTag.ORDER) {
              return false;
          }
  
          if (context.checkIfInDontApplySet(this, op1)) {
              return false;
          }
          context.addToDontApplySet(this, op1);
          OrderOperator oo = (OrderOperator) op1;
  
          return extractComplexExpressions(oo, oo.getOrderExpressions(), context);
      }
  
      static boolean extractComplexExpressions(ILogicalOperator op,
              List<Pair<IOrder, Mutable<ILogicalExpression>>> exprList, IOptimizationContext context)
              throws AlgebricksException {
          return extractComplexExpressions(op, exprList, Pair::getSecond, AnalysisUtil::isAccessToFieldRecord, context);
      }
  }
  