Dandandan commented on pull request #9639:
URL: https://github.com/apache/arrow/pull/9639#issuecomment-791742280


   hm it seems it's slightly more complicated
   
   * `DataFrame::collect` currently also runs `optimize` (makes sense, as this 
is a kind of a last "build" function)
   * But not every user wants to run collect (e.g. in Ballista, the logical 
plan from the DataFrame is used, it is not directly collected)


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