friendlymatthew commented on PR #7808:
URL: https://github.com/apache/arrow-rs/pull/7808#issuecomment-3015640662

   I envision two main use cases for variant-- 1) building up objects with a 
known schema (schema on write) and 2) building up objects with an unknown 
schema (schema on read). 
   
   - `bench_object_list_same_schemas` builds up a list of objects with the same 
field names with random values
   - `bench_object_list_unknown_schema` builds up a list of objects with 
_random_ field names with random values
   
   I also included `bench_object_field_names_reverse_order`. This case builds 
an object with field names inserted in the reverse lexicographical order. I 
think this is interesting because we can test the sorting behavior in 
`ObjectBuilder::finish`. 
   
   
   I ran benchmarks locally, and I observed a general improvement in 
performance. 
   
   <img width="739" alt="Screenshot 2025-06-28 at 11 51 55 AM" 
src="https://github.com/user-attachments/assets/2c1aa52b-393f-4222-8bf0-33e7017eb725";
 />
   
   
   `bench_object_list_same_schemas` seems to have a small regression, but it's 
not very much above noise and the much larger improvements to the other flows 
make me not too concerned about it. 
   
   


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