GitHub user HuaHuaY added a comment to the discussion: Thread Safety for 
parquet::arrow::FileReader::GetRecordBatch

It sounds to me like this has nothing to do with whether the row group IDs of 
multiple `RecordBatchReader`s overlap. I suspect it depends on the actual 
capabilities supported by the `InputStream`. If we were to make a thread-safety 
guarantee regarding the interface, it would likely be: "Whether the result of 
`GetRecordBatchReader` is thread-safe depends on the safety of certain 
underlying parameters."

GitHub link: 
https://github.com/apache/arrow/discussions/51369#discussioncomment-18477508

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