andygrove commented on code in PR #4067:
URL: https://github.com/apache/datafusion-comet/pull/4067#discussion_r3140218918


##########
spark/src/main/scala/org/apache/comet/serde/aggregates.scala:
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@@ -245,6 +247,10 @@ object CometSum extends CometAggregateExpressionSerde[Sum] 
{
 }
 
 object CometFirst extends CometAggregateExpressionSerde[First] {
+
+  override def getCompatibleNotes(): Seq[String] = Seq(

Review Comment:
   - `getCompatibleNotes` is for compatibility issues that we decided to accept 
and still accelerate the expression
   - `getIncompatibleReasons` is for compatibility issues that we decided to 
fall back for and have user opt-in



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