text: // 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.
  
  
  #ifndef IMPALA_EXEC_EMPTY_SET_NODE_H_
  #define IMPALA_EXEC_EMPTY_SET_NODE_H_
  
  #include "exec/exec-node.h"
  
  namespace impala {
  
  /// Node that returns an empty result set, i.e., just sets eos_ in GetNext().
  /// Corresponds to EmptySetNode.java in the FE.
  class EmptySetNode : public ExecNode {
   public:
    EmptySetNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
    virtual Status GetNext(RuntimeState* state, RowBatch* row_batch, bool* eos);
  };
  
  }
  
  #endif
  