friendlymatthew opened a new pull request, #21257:
URL: https://github.com/apache/datafusion/pull/21257

   ## Rationale for this change
   
   This PR adds a benchmark comparing top-level column access against struct 
field access for the same logical data
   
   #20925 introduced leaf level projection masking so that projecting a single 
struct field skips decoding its siblings. #21180 added benchmarks measuring 
that improvement across different strcut shapes. But neither benchmark answers 
how struct field access compare to reading the same column at the top level. 
Without that baseline, it's hard to know how much overhead the struct access 
path itself adds


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