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  uint32_t get_key_image(std::basic_string <unsigned char> &buff, uint32_t length);
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  void set_key_image(const unsigned char *buff,uint32_t length);
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  void sql_type(String &str) const;
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  virtual unsigned char *pack(unsigned char *to, 
 
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  virtual unsigned char *pack(unsigned char *to,
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                              const unsigned char *from,
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                              uint32_t max_length,
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                              bool low_byte_first);
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  unsigned char *pack_key(unsigned char *to, const unsigned char *from, uint32_t max_length, bool low_byte_first);
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  unsigned char *pack_key_from_key_image(unsigned char* to,
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                                         const unsigned char *from,
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                                         uint32_t max_length,
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                                         bool low_byte_first);
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  virtual const unsigned char *unpack(unsigned char* to,
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                                      const unsigned char *from,
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                                      uint32_t param_data,
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                                      bool low_byte_first);
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  const unsigned char *unpack_key(unsigned char* to, const unsigned char *from,
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                          uint32_t max_length, bool low_byte_first);
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  int pack_cmp(const unsigned char *a, const unsigned char *b, uint32_t key_length,
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               bool insert_or_update);
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  int pack_cmp(const unsigned char *b, uint32_t key_length,bool insert_or_update);
 
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  int cmp_binary(const unsigned char *a,const unsigned char *b, uint32_t max_length=UINT32_MAX);
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  int key_cmp(const unsigned char *,const unsigned char*);
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  int key_cmp(const unsigned char *str, uint32_t length);
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  uint32_t packed_col_length(const unsigned char *to, uint32_t length);
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  uint32_t max_packed_col_length(uint32_t max_length);
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  uint32_t data_length();
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  uint32_t used_length();
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  uint32_t size_of() const { return sizeof(*this); }
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  enum_field_types real_type() const { return DRIZZLE_TYPE_VARCHAR; }
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  Field *new_key_field(MEM_ROOT *root, Table *new_table,
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                       unsigned char *new_ptr, unsigned char *new_null_ptr,
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                       uint32_t new_null_bit);
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  uint32_t is_equal(CreateField *new_field);
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  void hash(uint32_t *nr, uint32_t *nr2);
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private:
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  int do_save_field_metadata(unsigned char *first_byte);
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};
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#endif /* DRIZZLED_FIELD_VARSTRING_H */