indexed_column.h

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/** @file storage/temptable/include/temptable/indexed_column.h
TempTable Indexed Column. */
 
#ifndef TEMPTABLE_INDEXED_COLUMN_H
#define TEMPTABLE_INDEXED_COLUMN_H
 
#include <cstddef>
 
#include "m_ctype.h"
#include "sql/field.h"
#include "sql/key.h"
#include "storage/temptable/include/temptable/cell_calculator.h"
 
namespace temptable {
 
class Indexed_column {
 public:
  /** Default constructor used for std::array initialization in Index. */
  Indexed_column() = default;
 
  explicit Indexed_column(const KEY_PART_INFO &mysql_key_part);
 
  size_t field_index() const;
 
  uint32_t prefix_length() const;
 
  const Cell_calculator &cell_calculator() const;
 
 private:
  /** The position of the indexed column. It can range from 1 to MAX_FIELDS.
  Use an appropriate datatype that can hold these values. */
  uint16_t m_mysql_field_index;
  uint32_t m_prefix_length;
  Cell_calculator m_cell_calculator;
};
 
/* Implementation of inlined methods. */
 
inline Indexed_column::Indexed_column(const KEY_PART_INFO &mysql_key_part)
    : m_mysql_field_index(static_cast<decltype(m_mysql_field_index)>(
          mysql_key_part.field->field_index())),
      m_prefix_length(mysql_key_part.length),
      m_cell_calculator(mysql_key_part) {
  assert(mysql_key_part.field->field_index() <=
         std::numeric_limits<decltype(m_mysql_field_index)>::max());
}
 
inline size_t Indexed_column::field_index() const {
  return m_mysql_field_index;
}
 
inline uint32_t Indexed_column::prefix_length() const {
  return m_prefix_length;
}
 
inline const Cell_calculator &Indexed_column::cell_calculator() const {
  return m_cell_calculator;
}
 
} /* namespace temptable */
 
#endif /* TEMPTABLE_INDEXED_COLUMN_H */