presto-main/src/main/java/io/prestosql/operator/scalar/RowComparisonOperator.java/RowComparisonOperator/RowComparisonOperator
class RowComparisonOperator:    protected RowComparisonOperator(OperatorType operatorType)
    {
        super(operatorType,
                ImmutableList.of(orderableWithVariadicBound("T", StandardTypes.ROW)),
                ImmutableList.of(),
                BOOLEAN.getTypeSignature(),
                ImmutableList.of(new TypeSignature("T"), new TypeSignature("T")),
                false);
    }