Jefffrey commented on PR #10569:
URL: https://github.com/apache/arrow-rs/pull/10569#issuecomment-5216324961

   is this something we should raise as a question to parquet and/or 
parquet-java (formerly parquet-mr)? it does seem that this decision stemmed 
from parquet-mr (as linked in the issue thread, 
https://github.com/apache/parquet-java/pull/30) and the implementation here 
followed that (https://github.com/sunchao/parquet-rs/pull/196)
   
   i was trying to check the parquet format at version 1.0.0 and was quite 
confused as my read was nothing prevents fixed len byte arrays from being 
dictionary encoded either 🤔 
   
   - 
https://github.com/apache/parquet-format/blob/parquet-format-1.0.0/src/thrift/parquet.thrift#L133-L136
   - 
https://github.com/apache/parquet-format/blob/parquet-format-1.0.0/README.md#dictionary-encoding-plain_dictionary--2
   - https://parquet.apache.org/docs/file-format/versions/


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