presto-hive/src/main/java/io/prestosql/plugin/hive/coercions/DecimalCoercers.java/ShortDecimalToDoubleCoercer/ShortDecimalToDoubleCoercer
class ShortDecimalToDoubleCoercer:        public ShortDecimalToDoubleCoercer(DecimalType fromType)
        {
            super(fromType, DOUBLE);
            rescale = longTenToNth(fromType.getScale());
        }