presto-main/src/main/java/io/prestosql/type/DecimalSaturatedFloorCasts.java/DecimalSaturatedFloorCasts/bigintToBigintFloorSaturatedCast
class DecimalSaturatedFloorCasts:    private static BigInteger bigintToBigintFloorSaturatedCast(BigInteger value, int sourceScale, int resultPrecision, int resultScale)
    {
        return bigDecimalToBigintFloorSaturatedCast(new BigDecimal(value, sourceScale), resultPrecision, resultScale);
    }