nealrichardson commented on pull request #7236:
URL: https://github.com/apache/arrow/pull/7236#issuecomment-632169594


   @jorisvandenbossche that part is a little magical. `tab$metadata$foo <- 42` 
essentially gets the list from `tab$metadata` anonymously, does `that$foo <- 
42`, and then assigns `tab$metadata <- that`. So there's only one path to 
updating at the C++ level, replacing the whole metadata object.


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