it would be useful to have the possibilty to choose multiple columns in the Reference Row Filter node, similar as you can choose multiple pairs of columns in the Joiner.
Of course I could use the Joiner instead, but that one is not streamable. A workaround that would not interrupt streaming is to concatenate together all columns I'd like to compare, but I figure that might be prone to errors (e.g. if you don't define a unique concatenation character) and there should be an easier way.
Let me know what you think about that.