v2/spanner-common/src/main/java/com/google/cloud/teleport/v2/spanner/ddl/Ddl.java [202:230]:
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  public List<String> createTableStatements() {
    List<String> result = new ArrayList<>();
    LinkedList<String> stack = Lists.newLinkedList();
    stack.addAll(childTableNames(ROOT));
    Set<String> visited = Sets.newHashSet();
    // Print depth first.
    while (!stack.isEmpty()) {
      String tableName = stack.pollFirst();
      Table table = tables.get(tableName);
      if (visited.contains(tableName)) {
        throw new IllegalStateException("Cycle!");
      }
      visited.add(tableName);
      StringBuilder statement = new StringBuilder();
      try {
        table.prettyPrint(statement, false, false);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      result.add(statement.toString());
      NavigableSet<String> children = childTableNames(table.name());
      if (children != null) {
        for (String name : children.descendingSet()) {
          stack.addFirst(name);
        }
      }
    }
    return result;
  }
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v1/src/main/java/com/google/cloud/teleport/spanner/ddl/Ddl.java [320:348]:
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  public List<String> createTableStatements() {
    List<String> result = new ArrayList<>();
    LinkedList<String> stack = Lists.newLinkedList();
    stack.addAll(childTableNames(ROOT));
    Set<String> visited = Sets.newHashSet();
    // Print depth first.
    while (!stack.isEmpty()) {
      String tableName = stack.pollFirst();
      Table table = tables.get(tableName);
      if (visited.contains(tableName)) {
        throw new IllegalStateException("Cycle!");
      }
      visited.add(tableName);
      StringBuilder statement = new StringBuilder();
      try {
        table.prettyPrint(statement, false, false);
      } catch (IOException e) {
        throw new RuntimeException(e);
      }
      result.add(statement.toString());
      NavigableSet<String> children = childTableNames(table.name());
      if (children != null) {
        for (String name : children.descendingSet()) {
          stack.addFirst(name);
        }
      }
    }
    return result;
  }
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