tustvold commented on PR #3115:
URL: https://github.com/apache/arrow-rs/pull/3115#issuecomment-1316357244

   > currently doesn't offer the capacity to advance without setting its value 
buffer
   This is by design, as it would allow for unitialised memory. My suggestion 
is that `into_builder` would create a builder with the same length as the array 
from which it was created, i.e. `array.into_builder().finish()` would be a 
no-op. Does that make sense?


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