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uint32_t size_of() const { return sizeof(*this); }
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uint32_t pack_length() const { return (uint32_t) bin_size; }
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uint32_t pack_length_from_metadata(uint32_t field_metadata);
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uint32_t is_equal(CreateField *new_field);
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virtual const unsigned char *unpack(unsigned char* to, const unsigned char *from,
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uint32_t param_data, bool low_byte_first);