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int cmp(const unsigned char *a __attribute__((unused)),
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const unsigned char *b __attribute__((unused))) { return 0;}
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void sort_string(unsigned char *buff __attribute__((unused)),
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uint32_t pack_length() const { return 0; }
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void sql_type(String &str) const;
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uint32_t max_display_length() { return 4; }