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