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To have separate values within one dimension, you'll need to ETL this before pulling it into Tableau. Separate rows for each tag.
I tried doing a split, and then I was hoping I could subsequently do a PIVOT on the created columns (which effectively would create separate rows for each value), but tableau wouldn't let me pivot the split columns.
That's too bad :/ I guess I'll just have to split each tag into a new field which shouldn't take too long.
Thanks for looking into it Joe!
I'm not sure if this is what is needed for your task,
but just wanted to pass along this thread where,
as Joe had said, a split then pivot can be done
outside Tableau. This is done for example in