Github user marmbrus commented on the issue:

    https://github.com/apache/spark/pull/15102
  
    > "I want to be able to add a topicpartition mid stream, but I don't want 
to start it from the beginning."
    
    I see, I was thinking only of new topics that appear that match your 
pattern.  I agree that if/when we add that ability to add existing partitions 
midstream we'd probably need to add two offsets in to the SQL offset for new 
partitions.
    
    > I think consistency in using json for any non-scalar values is worth 2 
extra characters per topic and 4 at the ends.
    
    I'd also support JSON here, but I would not mandate it (i.e. try json 
parsing and fall back to comma separation).  Its not ambiguous, supports 
consistent usage, and doesn't penalize the simple use cases.


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