wgtmac commented on PR #6649:
URL: https://github.com/apache/arrow-rs/pull/6649#issuecomment-2453714011

   Sorry for the late reply. I'm not sure whether we should fix reading or 
totally prohibit writing `repeated primitive fields without LIST annotation as 
a list type`. This is a gray area from the spec and should be discussed prior 
to the fix. The file added to parquet-testing is for interoperability across 
parquet implementations to have the same behavior. I have opened 
https://github.com/apache/parquet-format/pull/466 to clarify it.


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