friendlymatthew opened a new pull request, #20925:
URL: https://github.com/apache/datafusion/pull/20925

   - Added on from https://github.com/apache/datafusion/pull/20913
   
   Please review from the third commit
   
   ## Rationale for this change
   
   This PR reuses the `ParquetReadPlan` (introduced for the row filter 
pushdown) to also resolve projection expressions to parquet leaf column indices
   
   Previously, projecting a single field from a struct with many children would 
read all leaves of that struct. This aligns the projection path with the row 
filter path, which already had leaf-level struct pruning


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