rui-mo commented on code in PR #5750:
URL: https://github.com/apache/incubator-gluten/pull/5750#discussion_r1618121224


##########
backends-velox/src/main/scala/org/apache/gluten/backendsapi/velox/VeloxBackend.scala:
##########
@@ -376,13 +376,8 @@ object VeloxBackendSettings extends BackendSettingsApi {
       } else {
         t match {
           // OPPRO-266: For Velox backend, build right and left are both 
supported for
-          // LeftOuter and LeftSemi.
-          // FIXME Hongze 22/12/06
-          //  HashJoin.scala in shim was not always loaded by class loader.
-          //  The file should be removed and we temporarily disable the 
improvement
-          //  introduced by OPPRO-266 by commenting out the following 
prerequisite
-          //  condition.
-//          case LeftOuter | LeftSemi => true
+          // LeftOuter.
+          case LeftOuter => true

Review Comment:
   This function returns if building left is supported, which I assume 
indicates the backend's capability and shouldn't be mixed up the build side 
selection.
   
   > vanilla spark also choose build right.
   
   It is due to some special logic, e.g. preferredBuildSide, Gluten chooses to 
build left? If so, I think we need to fix there.



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