Spenserrrr commented on PR #58504:
URL: https://github.com/apache/spark/pull/58504#issuecomment-5532343545

   Thanks for the feedback! I added the number to the PR description. And yes 
it is not a big improvement on its own. It is saving ~20us of fixed cost per 
column, so it only shows as a ratio when per-row work is small: 1.7x on 50 
`long` columns, but 1.06x on `timestamp` at 10k rows. 
   
   Profiling also turned up two more per-column costs of the same kind in this 
path. Happy to fold them in here if you'd rather see the whole per-column 
budget in one PR. Thanks!


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