andygrove commented on PR #6076:
URL: 
https://github.com/apache/datafusion-comet/pull/6076#issuecomment-5950401917

   #6451 is now on `main`. It marks the five `regr_*` serdes `Incompatible` 
until the merge matches Spark, which is exactly what this PR does. With it 
merged in, three of your tests fail because the `regr_*` queries fall back to 
Spark. `statistical aggregates with large nearby values` and `statistical 
aggregates merge large nearby values across partitions` find 0 Comet aggregates 
instead of 2, and `statistical aggregates merge fractional constants across 
partitions` reports the #6423 fallback reason. Could you lift that marking in 
this PR? That means removing the `getSupportLevel` and `getIncompatibleReasons` 
overrides from `CometRegrBase` in `aggregates.scala`, restoring the six 
`regr_*` rows in `expressions.md`, dropping the five `allowIncompatible` lines 
from `regr.sql`, and deleting `regr_fallback.sql`. Your fractional-constants 
test already covers that data with two partitions asserted. The description can 
then say this PR is the real fix for #6423 and replaces #6451's fallback.
   


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