adriangb opened a new pull request, #19111:
URL: https://github.com/apache/datafusion/pull/19111

   Closes #14993
   
   Once this is merged I think we can say we support projection expression 
pushdown into scans and it is implemented for Parquet.
   
   Remaining TODOs which I think should be tracked in other issues (I'll find 
them or create them later):
   - Support for pushing down struct field access into the Parquet scan
   - Refactor other file sources that could push down expressions to use the 
same approach as Parquet (Avro?)
   - Replace remaining uses of `SchemaAdapter` with `PhysicalExprAdapter` and 
decide if we want to actually deprecate `SchemaAdapter`


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