Column Merger: Only allow mergin matching column types

Hi,

when cleaning up some data (caused by poor variable management), I noticed that the Column Merge allows to merge columns of different types which causes the column type to get converted to “Non-Native”.

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Usually, that should not be possible and get prevented in the frist place. Ideally, though, the fallback would be conversion to string type and throwing a warning (different topic). I’d like to suggest to:

  1. Display only matching column types
  2. Adding the option to display non-matching (which I’ve seen in another node recently) to prevent a dead end.

Best
Mike