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