v2/spanner-common/src/main/java/com/google/cloud/teleport/v2/spanner/ddl/Ddl.java [249:266]:
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  public HashMultimap<Integer, String> perLevelView() {
    HashMultimap<Integer, String> result = HashMultimap.create();
    LinkedList<String> currentLevel = Lists.newLinkedList();
    currentLevel.addAll(childTableNames(ROOT));
    int depth = 0;

    while (!currentLevel.isEmpty()) {
      LinkedList<String> nextLevel = Lists.newLinkedList();
      for (String tableName : currentLevel) {
        result.put(depth, tableName);
        nextLevel.addAll(childTableNames(tableName));
      }
      currentLevel = nextLevel;
      depth++;
    }

    return result;
  }
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v1/src/main/java/com/google/cloud/teleport/spanner/ddl/Ddl.java [467:484]:
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  public HashMultimap<Integer, String> perLevelView() {
    HashMultimap<Integer, String> result = HashMultimap.create();
    LinkedList<String> currentLevel = Lists.newLinkedList();
    currentLevel.addAll(childTableNames(ROOT));
    int depth = 0;

    while (!currentLevel.isEmpty()) {
      LinkedList<String> nextLevel = Lists.newLinkedList();
      for (String tableName : currentLevel) {
        result.put(depth, tableName);
        nextLevel.addAll(childTableNames(tableName));
      }
      currentLevel = nextLevel;
      depth++;
    }

    return result;
  }
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