romainfrancois commented on pull request #8122:
URL: https://github.com/apache/arrow/pull/8122#issuecomment-696593899


   The methods of `ParquetFileReader` no longer use tidyselect, i.e. you can 
use `$ReadTable()` or `$ReadTable(column_indices)` with an 0-based integer 
vector so this does not have to pay for retrieving the schema (which appears to 
be expensive) and invoke tidy selection. 
   
   `read_parquet(col_select=<tidy selection spec>)` is still supported though, 
and does call `$GetSchema()`. 
   
   In addition, methods `ReadRowGroup()` and `$ReadRowGroups()` have been 
added. 


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