edponce commented on PR #13009:
URL: https://github.com/apache/arrow/pull/13009#issuecomment-1112381270

   > That wouldn't work, because there are no specialized subclasses of 
ChunkedArray. We want the iterator to yield raw C values whose type is 
datatype-specific.
   ...I still think it can work for the `Array` types that currently support 
iteration (std::enable_if magic). The `ChunkedArrayIterator` in this PR can 
extract raw C values from a `ChunkedArray` so I am not suggesting something 
different.
   
   > It's used by `ApplyBinaryChunked`.
   My mistake, did a grep and thought only declaration/definition were in 
chunked_array.h/cc
   


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