alamb commented on issue #8643:
URL: https://github.com/apache/arrow-rs/issues/8643#issuecomment-3464051374

   Another interesting API question: How do we represent the metadata for a 
subset of columns/row groups? 
   
   Right now `ParquetMetaData` has apis in terms of 'row group index' (and 
column index)
   
   
   
https://github.com/apache/arrow-rs/blob/e9ea12b138f8fa11c6046e94cb2b55b2830a0d7c/parquet/src/file/metadata/mod.rs#L243-L247
   
   
   SO if we only got the RowGroupMetadata for 1 Row Group from a file with 10 
Row Groups what would `metadata.num_row_groups()` return? 
   
   The same question applies to columns chunks too I think
   
   


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