presto-main/src/main/java/io/prestosql/type/DateOperators.java/DateOperators/xxHash64
class DateOperators:    @ScalarOperator(XX_HASH_64)
    @SqlType(StandardTypes.BIGINT)
    public static long xxHash64(@SqlType(StandardTypes.DATE) long value)
    {
        return XxHash64.hash(value);
    }