andygrove commented on pull request #8118:
URL: https://github.com/apache/arrow/pull/8118#issuecomment-687844129


   Maybe I am misunderstanding, but I think there may be a flaw with this 
approach and we're not comparing apples with apples when looking at the 
benchmarks.
   
   The original code is dynamically building a struct using the builder. The 
new code starts with a `vec!` where everything is known at compile time. In 
theory, the builders should be more efficient than building a `Vec` and then 
converting it.


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