arunlakshman commented on issue #109: [NEMO-89] Clean up IRVertex#getClone() URL: https://github.com/apache/incubator-nemo/pull/109#issuecomment-414130821 Hi @johnyangk , I have made the chnages so that the unit test passes. But I am unsure about the following, In `IRVertex.java`, if we change the line 50 from ```super(IdManager.newVertexId());``` to ```super(that.getId());``` Then we get the following error in the tests ``` Tests in error: testLoopFusionPass(edu.snu.nemo.compiler.optimizer.pass.compiletime.reshaping.LoopFusionPassTest): The DAG does not contain [destination] of the edge: [vertex-12]->[vertex-13] in [vertex-10, vertex-11, vertex-9, vertex-12, vertex-13, vertex-3, vertex-4, vertex-1, vertex-2, vertex-7, vertex-8, vertex-5, vertex-6] Tests run: 31, Failures: 0, Errors: 1, Skipped: 0 ``` 1. Do we need to copy the ID of the existing vertex while cloning (That is what stated in the [JIRA](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-89)) 2. **OR** should we create new ID while cloning the vertex
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