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 org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.common.exceptions.ErrorCode;
  import org.apache.asterix.optimizer.rules.util.InsertUpsertCheckUtil;
  import org.apache.commons.lang3.mutable.Mutable;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalOperator;
  import org.apache.hyracks.algebricks.core.algebra.base.IOptimizationContext;
  import org.apache.hyracks.algebricks.core.rewriter.base.IAlgebraicRewriteRule;
  
  /**
   * This rule checks whether a returning clause for INSERT/UPSERT contains a dataset access.
   * NOTE: the rule should be invoked before rewriting Unnests (with dataset functions) into DataSourceScans.
   */
  public class CheckInsertUpsertReturningRule implements IAlgebraicRewriteRule {
  
      private boolean checked = false;
  
      @Override
      public boolean rewritePre(Mutable<ILogicalOperator> opRef, IOptimizationContext context)
              throws AlgebricksException {
          if (checked) {
              return false;
          }
          ILogicalOperator op = opRef.getValue();
          if (InsertUpsertCheckUtil.check(op)) {
              throw new CompilationException(ErrorCode.COMPILATION_INVALID_RETURNING_EXPRESSION, op.getSourceLocation());
          }
          checked = true;
          return false;
      }
  }
  