alamb commented on pull request #9401:
URL: https://github.com/apache/arrow/pull/9401#issuecomment-772759543


   @manojkarthick How about something along the lines of 
https://github.com/apache/arrow/blob/8a134013494eb7b15004ea7bba8bca8a9562ffdd/rust/parquet/src/file/metadata.rs#L656
   
   The test could create a  row group metadata with two columns and assert that 
`compressed_size()` returns the sum of the columns' size?


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