alamb commented on PR #15324:
URL: https://github.com/apache/datafusion/pull/15324#issuecomment-2744439698

   ๐Ÿค”  my measurements show Q3 getting quite a bit slower. I will rerun to test
   
   ```
   Comparing main_base and count-distinct-group
   --------------------
   Benchmark clickbench_extended.json
   --------------------
   โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”ณโ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”ณโ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”ณโ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”“
   โ”ƒ Query        โ”ƒ  main_base โ”ƒ count-distinct-group โ”ƒ       Change โ”ƒ
   โ”กโ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ•‡โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ•‡โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ•‡โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”โ”ฉ
   โ”‚ QQuery 0     โ”‚  1978.13ms โ”‚            1940.74ms โ”‚    no change โ”‚
   โ”‚ QQuery 1     โ”‚   736.56ms โ”‚             753.84ms โ”‚    no change โ”‚
   โ”‚ QQuery 2     โ”‚  1432.89ms โ”‚            4533.83ms โ”‚ 3.16x slower โ”‚
   โ”‚ QQuery 3     โ”‚   706.18ms โ”‚             716.03ms โ”‚    no change โ”‚
   โ”‚ QQuery 4     โ”‚  1492.33ms โ”‚            1498.56ms โ”‚    no change โ”‚
   โ”‚ QQuery 5     โ”‚ 17251.84ms โ”‚           17220.01ms โ”‚    no change โ”‚
   โ””โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ดโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ดโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”ดโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”˜
   ```


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