Datum decimal64_round(PG_FUNCTION_ARGS)
{
PGDecimal64 a = PG_GETARG_DECIMAL64(0);
int32_t scale = PG_GETARG_INT32(1);
PGDecimal64 ret;
static PGDecimal64* pquan;
static PGDecimal64 quan[16];
DECLARE_DEC_CTXT(DEC_INIT_DECIMAL64);
if (pquan == 0) {
int i;
PGDecimal64 ten;
decDoubleFromInt32(&ten, 10);
decDoubleFromInt32(&quan[0], 1);
for (i = 1; i < 16; i++) {
decDoubleDivide(&quan[i], &quan[i-1], &ten, &dc);
}
pquan = &quan[0];
}
if (scale < 0 || scale > 15) {
elog(ERROR, "decimal32 rounding to an invalid scale");
}
decDoubleQuantize(&ret, &a, &quan[scale], &dc);
PG_RETURN_DECIMAL64(ret);
}
Decimal64 DecimalUtil::quantize(Decimal64 value, Decimal64 exponent)
{
Decimal64 result = value;
decDoubleQuantize(result.data(),
value.data(),
exponent.data(),
getContext());
return result;
}
