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int store(const char *to,uint32_t length, const CHARSET_INFO * const cs)=0;
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uint32_t size_of() const { return sizeof(*this); }
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const CHARSET_INFO *charset(void) const { return field_charset; }
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enum Derivation derivation(void) const { return field_derivation; }
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virtual void set_derivation(enum Derivation derivation_arg)
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{ field_derivation= derivation_arg; }