alamb commented on PR #19355:
URL: https://github.com/apache/datafusion/pull/19355#issuecomment-3720225989

   I do see a reproducable speedup on q28 which I think is real
   
   ```
   │ QQuery 28    │ 24356.16 ms │             21846.79 ms │ +1.11x faster │
   ```
   
   Query 28 is: 
https://github.com/apache/datafusion/blob/92d8632b01b9897a5fd1f9fdb753156b847e8ba9/benchmarks/queries/clickbench/queries/q28.sql#L4
   
   ```sql
   SELECT REGEXP_REPLACE("Referer", '^https?://(?:www\.)?([^/]+)/.*$', '\1') AS 
k, AVG(length("Referer")) AS l, COUNT(*) AS c, MIN("Referer") FROM hits WHERE 
"Referer" <> '' GROUP BY k HAVING COUNT(*) > 100000 ORDER BY l DESC LIMIT 25;
   ```
   
   It is not clear to me what is responsible


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