Function floatToNanos

pkg/sql/sem/tree/interval.go:666–668

floatToNanos converts a fractional number representing nanoseconds to the number of integer nanoseconds. For example: ".354874219" to "354874219" or ".123" to "123000000". This function takes care to round correctly when a naive conversion would incorrectly truncate due to floating point inaccuracie

(f float64)

// https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/adt/timestamp.c;h=449164ae7e5b00f6580771017888d4922685a73c;hb=HEAD#l1511
// https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/port/rint.c;h=d59d9ab774307b7db2f7cb2347815a30da563fc5;hb=HEAD
func floatToNanos(f float64) int64 {
	return int64(math.Round(f * float64(time.Second.Nanoseconds())))
}