[PR] Compatibility of schemas with inner types [arrow-julia]

[via GitHub]

poncito opened a new pull request, #504:
URL: https://github.com/apache/arrow-julia/pull/504

   Hi,
   
   Here is a minimal example of the issue I've encountered.
   
   ```julia
    struct A
       x::Int
   end
   
   struct B
       a::A
   end
   
   v = [B(A(i)) for i =1:3]
   
   io = IOBuffer()
   Arrow.write(io, v; file=false)
   seekstart(io)
   Arrow.append(io, v) # throws
   ```
   
   I don't know if this is really necessary, or if I'm not using this library 
properly, but this issue makes it difficult to append to arrow files with 
nested types.
   
   Since I've only added more cases where the call to `append` can succeed, I 
do not think that this creates retro-compatibility issues.
   
   Thanks for the review!


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