fallintoplace opened a new pull request, #1004:
URL: https://github.com/apache/arrow-go/pull/1004

   ### Rationale for this change
   
   The Codec contract allows a nil or undersized destination and requires the 
codec to allocate when needed. The uncompressed codec returned the unchanged 
destination, producing empty or truncated output.
   
   ### What changes are included in this PR?
   
   Use append-based copying for Encode, EncodeLevel, and Decode so the 
destination is reused when possible and grown when necessary. Add nil and 
undersized destination tests.
   
   ### Are these changes tested?
   
   Yes. go test ./parquet/compress
   
   ### Are there any user-facing changes?
   
   The uncompressed codec now follows the same destination allocation contract 
as the compressed codecs.


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