marin-ma commented on code in PR #12838:
URL: https://github.com/apache/gluten/pull/12838#discussion_r3870958491


##########
backends-velox/src/test/scala/org/apache/gluten/execution/CudfBroadcastJoinSuite.scala:
##########
@@ -72,7 +72,28 @@ class CudfBroadcastJoinSuite extends 
VeloxWholeStageTransformerSuite {
         // demoted or fallen back.
         val bhj = collect(plan) { case j: BroadcastHashJoinExecTransformer => 
j }
         assert(bhj.nonEmpty, s"expected an offloaded broadcast hash join, 
got:\n$plan")
-        assert(df.count() > 0, "broadcast join must not return empty results 
(GLUTEN-12471)")
+        assert(df.count() > 0, "broadcast join must not return empty results 
(GLUTEN-12812)")
+    }
+  }
+
+  test("GLUTEN-12838: broadcast build side follows the consuming stage's cuDF 
tag") {
+    // We need a broadcast that lands in a CPU stage. NOT IN gives us one for 
free: it

Review Comment:
   @ReemaAlzaid Thanks for adding the test. My understanding is that we need to 
test broad cast in a CPU stage + hash join in a CPU stage when cudf is enabled 
based on your issue description:
   
   > VeloxRuntime::createColumnarBatchSerializer returns 
VeloxGpuColumnarBatchSerializer and every broadcast batch is uploaded to the 
device even when the consuming stage was not offloaded to cuDF and planned a 
host-contract value stream.
   
   Does this test cover this case?



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