Hi,
In the Column Combiner node, if you include a space character in the Delimiter box, this is lost in the output.
i.e. If you have a cell in Column A of "KNIME", and in Column B is "Is", and in Column C is "Great", and then use the Column Combiner with delimiter box set as ", " you get the result below:
KNIME,Is,Great
rather than..
KNIME, Is, Great
Simon.