wesm commented on pull request #7593:
URL: https://github.com/apache/arrow/pull/7593#issuecomment-652045953

   @xhochy I'm fixing a couple issues with the implementation:
   * The function executor allocates memory for you unless you explicitly 
disable it. The idea is that you don't want to do allocations in-kernel unless 
it is necessary. The preallocation settings affect how execution with chunked 
arrays work
   * The slice offset of the `Datum* out` parameter must be respected (it may 
be non-zero -- the executor does not preserve the chunk layout of ChunkedArrays 
and will merge chunks to make larger output arrays -- this can be configured in 

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