wonook commented on a change in pull request #23: [NEMO-67] Fix Communication 
Pattern for Beam CoGroupByKey transform
URL: https://github.com/apache/incubator-nemo/pull/23#discussion_r190808251
 
 

 ##########
 File path: 
compiler/frontend/beam/src/main/java/edu/snu/nemo/compiler/frontend/beam/NemoPipelineVisitor.java
 ##########
 @@ -241,6 +241,19 @@ private static BeamCoder getCoderForView(final ViewFn 
viewFn, final Coder beamIn
    */
   private static DataCommunicationPatternProperty.Value 
getEdgeCommunicationPattern(final IRVertex src,
                                                                                
     final IRVertex dst) {
+    try {
+      final Class<?> constructUnionTableFn = Class.forName(
+          
"org.apache.beam.sdk.transforms.join.CoGroupByKey$ConstructUnionTableFn");
+      if (src instanceof OperatorVertex && ((OperatorVertex) 
src).getTransform() instanceof DoTransform
 
 Review comment:
   Also for this bit of code, why is it that it cannot be included in the 
if-else statement below?

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