On a Mac, I found a useful procedure here for enabling the pasting of a Unicode character into the current text box. Using this, I opened the ConvertCSVToAvro processor dialog, then the CSV Delimiter property value dialog. Then using the procedure I selected character \u0001, which pastes it into the property (although it is not a visible character so you won't see it on the screen). Click OK then Apply and the delimiter should be set to \u0001. I tried this with a simple example and it worked. On Windows I think you can use the Character Map or something similar, but the idea is to either have some utility copy a unicode character to the clipboard for pasting into the property value dialog, or perhaps it will paste for you (like the Mac utility). Once NIFI-2369 is resolved, there might be a way to use Expression Language to make this more visible, like ${literal('\u0001')} or something. Alternatively, you could use a scripting processor like ExecuteScript and do the split with code (Javascript, Groovy, e.g.)
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