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For up to 127 bytes length, InnoDB would use 1 byte for length, and that byte would always be less than 128. If the maximum length is longer than 255 bytes, InnoDB would use a variable-length encoding for the length, using 1 byte for lengths up to 127 bytes, and 2 bytes for longer lengths. Thus, 1-byte lengths are always compatible when the maximum size changes from less than 128 bytes to anything longer. Field_varstring::is_equal(): Return IS_EQUAL_PACK_LENGTH also when converting from VARCHAR less than 128 bytes to any longer VARCHAR.