odps-sdk/odps-sdk-graph/src/main/java/com/aliyun/odps/graph/DefaultComputingVertexResolver.java [183:196]:
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  protected Vertex<I, V, E, M> removeVertexIfDesired(I vertexId,
                                                     Vertex<I, V, E, M> vertex,
                                                     VertexChanges<I, V, E, M> vertexChanges)
      throws IOException {
    if (hasVertexRemovals(vertexChanges)) {
      if (vertex == null) {
        throw new IOException("ODPS-0730001: Remove vertex(Id: '" + vertexId
                              + "') that does not exist");
      } else {
        vertex = null;
      }
    }
    return vertex;
  }
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odps-sdk/odps-sdk-graph/src/main/java/com/aliyun/odps/graph/DefaultLoadingVertexResolver.java [166:179]:
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  protected Vertex<I, V, E, M> removeVertexIfDesired(I vertexId,
                                                     Vertex<I, V, E, M> vertex,
                                                     VertexChanges<I, V, E, M> vertexChanges)
      throws IOException {
    if (hasVertexRemovals(vertexChanges)) {
      if (vertex == null) {
        throw new IOException("ODPS-0730001: GraphLoader remove vertex(Id: '" + vertexId
                              + "') that does not exist");
      } else {
        vertex = null;
      }
    }
    return vertex;
  }
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