hbase-scan-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_HBASE_SCAN_NODE_H_
#define IMPALA_EXEC_HBASE_SCAN_NODE_H_

#include <boost/scoped_ptr.hpp>
#include "runtime/descriptors.h"
#include "exec/hbase-table-scanner.h"
#include "exec/scan-node.h"

namespace impala {

class TextConverter;
class Tuple;

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

  ~HBaseScanNode();

  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);

  const int suggested_max_caching() const { return suggested_max_caching_; }

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

 private:
  const static int SKIP_COLUMN = -1;
  const static int ROW_KEY = 0;

  static bool CmpColPos(const SlotDescriptor* a, const SlotDescriptor* b);

  const std::string table_name_;

  TupleId tuple_id_;

  const TupleDescriptor* tuple_desc_;

  int tuple_idx_;

  HBaseTableScanner::ScanRangeVector scan_range_vector_;

  std::vector<THBaseFilter> filters_;

  int num_errors_;

  boost::scoped_ptr<MemPool> tuple_pool_;

  boost::scoped_ptr<HBaseTableScanner> hbase_scanner_;

  std::vector<SlotDescriptor*> sorted_non_key_slots_;

  std::vector<const HBaseTableDescriptor::HBaseColumnDescriptor* > sorted_cols_;

  SlotDescriptor* row_key_slot_;

  bool row_key_binary_encoded_;

  int tuple_buffer_size_;

  Tuple* tuple_;

  boost::scoped_ptr<TextConverter> text_converter_;

  int suggested_max_caching_;

  void WriteTextSlot(
      const std::string& family, const std::string& qualifier,
      void* value, int value_length, SlotDescriptor* slot,
      RuntimeState* state, bool* error_in_row);
};

}

#endif