andygrove commented on code in PR #3982:
URL: https://github.com/apache/datafusion-comet/pull/3982#discussion_r3103609970


##########
spark/src/main/scala/org/apache/spark/sql/comet/execution/shuffle/CometShuffleExchangeExec.scala:
##########
@@ -450,12 +456,17 @@ object CometShuffleExchangeExec
         false
     }
 
+    // Preserve any prior-pass fallback decision (see `CometFallback`).
+    if (isMarkedForFallback(s)) {
+      return false
+    }
+
     if (!isCometShuffleEnabledWithInfo(s)) {
       return false
     }
 
     if (CometConf.COMET_DPP_FALLBACK_ENABLED.get() && stageContainsDPPScan(s)) 
{
-      withInfo(s, "Stage contains a scan with Dynamic Partition Pruning")
+      markForFallback(s, "Stage contains a scan with Dynamic Partition 
Pruning")

Review Comment:
   having two approaches seems a bit hacky though. I filed follow on issue to 
clean this up. https://github.com/apache/datafusion-comet/issues/3984



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