zjuwangg commented on code in PR #10667:
URL: 
https://github.com/apache/incubator-gluten/pull/10667#discussion_r2340877605


##########
backends-velox/src/test/scala/org/apache/gluten/execution/MiscOperatorSuite.scala:
##########
@@ -524,6 +524,74 @@ class MiscOperatorSuite extends 
VeloxWholeStageTransformerSuite with AdaptiveSpa
     }
   }
 
+  test("optimize sort window to streaming window") {
+    withSQLConf(VeloxConfig.COLUMNAR_VELOX_WINDOW_TYPE.key -> "sort") {

Review Comment:
   > Just curious why you choose to use sort window not straeming window in you 
env? Because the sort operator already before the window opeartor, and then we 
can directly use the StreamigWindow in velox side.
   
   In fact, in our env we also using streaming window instead of sort window. 
But we observed such optimization can be made when sort window is used.



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