zeroshade opened a new pull request, #520:
URL: https://github.com/apache/arrow-go/pull/520

   ### Rationale for this change
   fixes #490 
   
   ### What changes are included in this PR?
   When using `PutDictionary` to write an arrow dictionary array to Parquet 
directly, we will now normalize the data type to a parquet physical storage 
type to avoid type problems. e.g. A dictionary with `int8` values will get cast 
to `int32` values before we process it so that all of the remaining encoding 
code can continue to be based on the physical storage type. This alleviates 
panics when using `pqarrow` to write Dictionary arrays.
   
   ### Are these changes tested?
   Yes, the unit tests are updated to include tests for int8/uint8/etc. as 
dictionary value types.
   
   ### Are there any user-facing changes?
   No, just fixing panics.
   


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