[I] Add a method to return the number of skipped rows in a `RowSelection` [arrow-rs]

["progval (via GitHub)" <gi...@apache.org>]

progval opened a new issue, #6428:
URL: https://github.com/apache/arrow-rs/issues/6428

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   `RowSelection` has a `row_count` method that returns the number of selected rows, but is missing a way to count the number of de-selected rows without iterating on the selectors
   
   **Describe the solution you'd like**
   
   Implement it as `RowSelection::skipped_row_count`
   
   **Describe alternatives you've considered**
   
   current state, which is that users have to reimplement it themselves
   
   **Additional context**
   
   Datafusion had to implement it here:
   
   https://github.com/apache/datafusion/blob/f2159e6cae658a0a3f561ec2d15ea948213fd0f8/datafusion/core/src/datasource/physical_plan/parquet/page_filter.rs#L271-L277
   


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Re: [I] Add a method to return the number of skipped rows in a `RowSelection` [arrow-rs]

["tustvold (via GitHub)" <gi...@apache.org>]

tustvold closed issue #6428: Add a method to return the number of skipped rows in a `RowSelection`
URL: https://github.com/apache/arrow-rs/issues/6428


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