rdettai opened a new pull request #8682:
URL: https://github.com/apache/arrow/pull/8682


   > Getting the range of bytes of a column chunk inside a parquet file can be 
useful for external crates (for instance if they want to pre-fetch the 
columns), and is not completely obvious (it is enough to take a look at [1] and 
[2] to see that things can quickly get messy).
   > 
   > I think it would be nice to move this logic in the metadata definition 
rather than have lost it in the middle of the reader implem.
   > 
   > [1] 
https://stackoverflow.com/questions/55225108/why-is-dictionary-page-offset-0-for-plain-dictionary-encoding/
   > [2] https://issues.apache.org/jira/browse/PARQUET-816
   
   https://issues.apache.org/jira/browse/ARROW-10620


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