GitHub user sclmn created a discussion: Dictionary page offset logic

I was looking at this 
[code](https://github.com/apache/arrow/blob/main/cpp/src/parquet/file_reader.cc#L180)
 and wondered about the checks.

- I'm not sure why there is a check that the dictionary page offset is greater 
than 0? If this isn't a dictionary page, should it be not set (first condition)?
- Is it possible for the data page offset to equal 0 (when we don't have data 
pages)?

GitHub link: https://github.com/apache/arrow/discussions/48184

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