haohuaijin commented on PR #10702:
URL: https://github.com/apache/arrow-rs/pull/10702#issuecomment-5302965985

   > In my mind the trick will be how to mesh the existing apis 
(with_row_groups and with_row_selection) and make sure we have a coherent 
documentation of what will happen if the user calls each one
   
   This PR adds `ParquetPushDecoderBuilder::with_row_group_selections` so 
callers can supply row-group-local RowSelections directly. The new 
configuration is mutually exclusive with `with_row_groups` / 
`with_row_selection`: an internal state machine catches any conflicting 
combination in any call order and reports it as an error from `build()`, the 
legacy APIs keep their exact semantics, and each setter's docs spell out how it 
interacts with the others.
   
   cc @alamb @zhuqi-lucas 


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