docs: @NonNull
    public BatchStatementBuilder addStatements(@NonNull Iterable<BatchableStatement<?>> statements) {
      int delta = Iterables.size(statements);
      if (statementsCount + delta > 0xFFFF) {
        throw new IllegalStateException(
            "Batch statement cannot contain more than " + 0xFFFF + " statements.");
      }
      statementsCount += delta;
      statementsBuilder.addAll(statements);
      return this;
    }