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const uchar *unpack_key(uchar* to, const uchar *from,
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uint max_length, bool low_byte_first);
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int pack_cmp(const uchar *a, const uchar *b, uint key_length,
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uint packed_col_length(const uchar *col_ptr, uint length);
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uint max_packed_col_length(uint max_length);
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void free() { value.free(); }