presto-main/src/main/java/io/prestosql/operator/scalar/JsonOperators.java/JsonOperators/xxHash64
class JsonOperators:    @ScalarOperator(XX_HASH_64)
    @SqlType(BIGINT)
    public static long xxHash64(@SqlType(JSON) Slice value)
    {
        return XxHash64.hash(value);
    }