Github user felixcheung commented on the issue:

    https://github.com/apache/spark/pull/17115
  
    great thanks!
    - we could say return a `vector of` in cases it makes sense
    - `colnames<- does allow the subset assignment` - would be good to add 
example and tests if we don't have it already! ;)
    - `path <- "path/to/file.json"` yea it doesn't exist, it's mean to 
illustrate reading from a file. We have "don't run" for the examples so it 
doesn't matter much, but if you have ideas on how to make it more clear or 
concrete I'd definitely welcome that


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