mysql 中decimal数据结构

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typedef int32 decimal_digit_t;

/**
intg is the number of decimal digits (NOT number of decimal_digit_t’s !)
before the point
frac is the number of decimal digits after the point
len is the length of buf (length of allocated space) in decimal_digit_t’s,
not in bytes
sign false means positive, true means negative
buf is an array of decimal_digit_t’s
*/
typedef struct st_decimal_t {
int intg, frac, len;
my_bool sign;
decimal_digit_t *buf;
} decimal_t;