Function FromBigInt

postgres/parser/duration/duration.go:216–232

FromBigInt converts a big.Int number of nanoseconds to a duration. Inverse conversion of AsBigInt. Boolean false if the result overflows.

(src *big.Int)

// FromBigInt converts a big.Int number of nanoseconds to a duration. Inverse
// conversion of AsBigInt. Boolean false if the result overflows.
func FromBigInt(src *big.Int) (Duration, bool) {
	var rem big.Int
	var monthsDec big.Int
	monthsDec.QuoRem(src, bigNanosInMonth, &rem)
	if !monthsDec.IsInt64() {
		return Duration{}, false
	}

	var daysDec big.Int
	var nanosRem big.Int
	daysDec.QuoRem(&rem, bigNanosInDay, &nanosRem)
	// Note: we do not need to check for overflow of daysDec because any
	// excess bits were spilled into months above already.

	d := Duration{Months: monthsDec.Int64(), Days: daysDec.Int64(), nanos: nanosRem.Int64()}
	return d.normalize().round(), true
}

// AsInt64 converts a duration to an int64 number of seconds.
// The conversion may overflow, in which case the boolean return