Owen O'Malley commented on ORC-305:

[~xndai] as you say, we can compute this from the statistics we already have. 
Please create a separate jira for adding the method to the ColumnStatistics 

> Add column statistics for the size on disk
> ------------------------------------------
>                 Key: ORC-305
>                 URL: https://issues.apache.org/jira/browse/ORC-305
>             Project: ORC
>          Issue Type: Test
>            Reporter: Owen O'Malley
>            Assignee: Sandeep More
>            Priority: Major
> It would be great to have the size on disk of each column.
> You can generate this by adding up the sizes of the dictionary and data 
> streams.
> It is only relevant at the stripe and file level.

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