Marco Lugo created AVRO-4031:
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             Summary: Writer::append_to_with_codec cannot take block_size so it 
falls back to default even if original Writer had a different size
                 Key: AVRO-4031
                 URL: https://issues.apache.org/jira/browse/AVRO-4031
             Project: Apache Avro
          Issue Type: Improvement
          Components: rust
            Reporter: Marco Lugo


Writer::append_to_with_codec is great to continue a writer but it can be 
inconsistent with the original writer in terms of block_size. If the original 
writer used a custom block_size then this new writer will fall back to 
DEFAULT_BLOCK_SIZE. This can be important when considering compression among 
other things.
 
I am not sure what the proper API should be here:
- Change append_to_with_codec's signature ro reflect this, which would be a 
breaking change;
- Add a new method, something like append_to_with_codec_and_block_size, but 
this does not feel very future proof;
- Allow the Writer builder to set has_header to true. If I'm understanding this 
correctly, this would be future proof and would not break backwards 
compatibility;
- Other?
 
>From the little context I have, I would be inclined to choose the 3rd option.
 
What would be the preferred option, if any? I'd be happy to open a PR once 
there is consensus on the way forward.

Thank you,
Marco



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