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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#ifndef IMPALA_EXEC_HDFS_SCAN_NODE_MT_H_
#define IMPALA_EXEC_HDFS_SCAN_NODE_MT_H_

#include <boost/scoped_ptr.hpp>

#include "exec/hdfs-scanner.h"
#include "exec/hdfs-scan-node-base.h"
#include "exec/scanner-context.h"

namespace impala {

class DescriptorTbl;
class ObjectPool;
class RuntimeState;
class RowBatch;
class TPlanNode;

/// Scan node that materializes tuples, evaluates conjuncts and runtime filters
/// in the thread calling GetNext(). Uses the HdfsScanner::GetNext() interface.
class HdfsScanNodeMt : public HdfsScanNodeBase {
 public:
  HdfsScanNodeMt(ObjectPool* pool, const TPlanNode& tnode, const DescriptorTbl& descs);
  ~HdfsScanNodeMt();

  virtual Status Prepare(RuntimeState* state);
  virtual Status Open(RuntimeState* state);
  virtual Status GetNext(RuntimeState* state, RowBatch* row_batch, bool* eos);
  virtual void Close(RuntimeState* state);

  virtual bool HasRowBatchQueue() const { return false; }

 private:
  /// Current scan range and corresponding scanner.
  DiskIoMgr::ScanRange* scan_range_;
  boost::scoped_ptr<ScannerContext> scanner_ctx_;
  boost::scoped_ptr<HdfsScanner> scanner_;
};

}

#endif