zhztheplayer commented on code in PR #9074:
URL: https://github.com/apache/incubator-gluten/pull/9074#discussion_r2057971387


##########
gluten-substrait/src/main/scala/org/apache/gluten/extension/columnar/validator/Validators.scala:
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@@ -137,6 +137,7 @@ object Validators {
       case p: CartesianProductExec if !settings.supportCartesianProductExec() 
=> fail(p)
       case p: TakeOrderedAndProjectExec if 
!settings.supportColumnarShuffleExec() => fail(p)
       case p: CollectLimitExec if !settings.supportCollectLimitExec() => 
fail(p)
+      case p: CollectTailExec if !settings.supportCollectTailExec() => fail(p)

Review Comment:
   > this validation would fail for CH and node should be tagged with false.
   
   I see. So you wanted to make it still add a tag but that tag is not actually 
used for determining whether the node is offload-able. 
   
   This sounds also reasonable. Would be better to have some comments for this 
on line :140?



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