alamb commented on issue #14993:
URL: https://github.com/apache/datafusion/issues/14993#issuecomment-3049039377

   I was thinking about this -- it isn't clear to me how to represent a 
pushdown of a subfield of a struct in a general way other than an expression 
like `extract(struct_col, "field_path")`
   
   The leaf column stuff is a parquet type system specific thing that doesn't 
map directly to Arrrow data types, etc


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