GitHub user duarten closed a discussion: Avoid re-encoding dictionaries when 
writing to Parquet

It seems we always [re-encode 
dictionaries](https://github.com/apache/arrow-rs/blob/main/parquet/src/arrow/arrow_writer/byte_array.rs#L342)
 when writing row groups to Parquet. 

Would it make sense to avoid this for cases where all/most dictionary values 
appear in all row groups?

GitHub link: https://github.com/apache/arrow-rs/discussions/8300

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