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