kosiew commented on PR #25051:
URL: https://github.com/apache/datafusion/pull/25051#issuecomment-5644656206

   @jayzhan211 
   
   > invoke_per_accumulator: state.size() is inside the timed region
   
   
[e6e4a85](https://github.com/apache/datafusion/pull/25051/commits/e6e4a85a55cba9375bca4741806ad45a7497aa78)
 moved `sizes_pre` collection before the timer and `sizes_post` collection 
after it. Only `f(accumulator, values)` is timed, retaining one timer pair per 
prepared chunk.
   
   > A regression test ... an accumulator whose `size()` sleeps, asserting the 
recorded duration stays small — would lock this in.
   
   
[e7d2d7e](https://github.com/apache/datafusion/pull/25051/commits/e7d2d7e4fa318436c2bbee520e5f7c3d8b9e73fc)
 added `adapter_grouped_update_excludes_size_accounting_from_metric`: 
`SlowSizeAccumulator::size()` sleeps 50 ms, while the grouped metric must 
remain below 25 ms.


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