cpp/src/gandiva/field_descriptor.h

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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 GANDIVA_FIELDDESCRIPTOR_H
#define GANDIVA_FIELDDESCRIPTOR_H

#include <string>

#include "gandiva/arrow.h"

namespace gandiva {

/// \brief Descriptor for an arrow field. Holds indexes into the flattened array of
/// buffers that is passed to LLVM generated functions.
class FieldDescriptor {
 public:
  static const int kInvalidIdx = -1;

  FieldDescriptor(FieldPtr field, int data_idx, int validity_idx = kInvalidIdx,
                  int offsets_idx = kInvalidIdx)
      : field_(field),
        data_idx_(data_idx),
        validity_idx_(validity_idx),
        offsets_idx_(offsets_idx) {}

  /// Index of validity array in the array-of-buffers
  int validity_idx() const { return validity_idx_; }

  /// Index of data array in the array-of-buffers
  int data_idx() const { return data_idx_; }

  /// Index of offsets array in the array-of-buffers
  int offsets_idx() const { return offsets_idx_; }

  FieldPtr field() const { return field_; }

  const std::string& Name() const { return field_->name(); }
  DataTypePtr Type() const { return field_->type(); }

  bool HasOffsetsIdx() const { return offsets_idx_ != kInvalidIdx; }

 private:
  FieldPtr field_;
  int data_idx_;
  int validity_idx_;
  int offsets_idx_;
};

}  // namespace gandiva

#endif  // GANDIVA_FIELDDESCRIPTOR_H