adriangb commented on PR #22698:
URL: https://github.com/apache/datafusion/pull/22698#issuecomment-5567507554

   A/A control on tpch10 
([trigger](https://github.com/apache/datafusion/pull/22698#issuecomment-5567324414):
 same PR head, same config on both sides) shows ±7–15% per-query swings (Q7 
1.14x, Q9 1.13x, Q17 1.15x, Q22 1.12x) and a 4% total difference between two 
runs of the identical binary. So the flag-off tpch "regression" in the 
main-vs-PR run above is noise; nothing in the flag-off path shows up above the 
floor. The same floor applies to single per-query flags in the other suites, so 
the tpcds +1.8% net with the flag on is suggestive, not proven; the 
microbenchmark result behind it (cheap-predicate reorders adopted with no 
payoff) is the more reliable evidence.
   


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