Github user DylanGuedes commented on the issue:

    https://github.com/apache/spark/pull/21045
  
    @mgaido91 Thank you for the suggestions and for being so patient. I updated 
the code with `zip` name, more tests in CollectionExpression (I'll add more 
after adding support to any number of arrays as input), the stripMargin syntax 
and a little refactor in the doGenCode (Is it the change that you was thinking 
of? I can make the code shorter but i'll be more complicated I think).
    I didn't find the proper way to add support to any number of arrays, since 
the number of inputs looks limited (unary, binary and ternary expressions, 
didn't find a "n-nary" or something similar). What you think?


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