exchange-node.h

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// Copyright 2012 Cloudera Inc.
//
// Licensed 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_EXCHANGE_NODE_H
#define IMPALA_EXEC_EXCHANGE_NODE_H

#include <boost/scoped_ptr.hpp>
#include "exec/exec-node.h"
#include "exec/sort-exec-exprs.h"

namespace impala {

class RowBatch;
class DataStreamRecvr;

class ExchangeNode : public ExecNode {
 public:
  ExchangeNode(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);

  virtual Status Init(const TPlanNode& tnode);
  virtual Status Prepare(RuntimeState* state);
  virtual Status Open(RuntimeState* state);
  virtual Status GetNext(RuntimeState* state, RowBatch* row_batch, bool* eos);
  virtual Status Reset(RuntimeState* state);
  virtual void Close(RuntimeState* state);

  void set_num_senders(int num_senders) { num_senders_ = num_senders; }

 protected:
  virtual void DebugString(int indentation_level, std::stringstream* out) const;

 private:
  Status GetNextMerging(RuntimeState* state, RowBatch* output_batch, bool* eos);

  Status FillInputRowBatch(RuntimeState* state);

  int num_senders_;  // needed for stream_recvr_ construction

  boost::shared_ptr<DataStreamRecvr> stream_recvr_;

  RowDescriptor input_row_desc_;

  RowBatch* input_batch_;

  int next_row_idx_;

  RuntimeProfile::Counter* convert_row_batch_timer_;

  bool is_merging_;

  SortExecExprs sort_exec_exprs_;
  std::vector<bool> is_asc_order_;
  std::vector<bool> nulls_first_;

  int64_t offset_;

  int64_t num_rows_skipped_;
};

};

#endif