presto-main/src/main/java/io/prestosql/operator/scalar/RowHashCodeOperator.java/RowHashCodeOperator/RowHashCodeOperator
class RowHashCodeOperator:    private RowHashCodeOperator()
    {
        super(HASH_CODE,
                ImmutableList.of(comparableWithVariadicBound("T", "row")),
                ImmutableList.of(),
                BIGINT.getTypeSignature(),
                ImmutableList.of(new TypeSignature("T")),
                false);
    }