docs: @NonNull
    public BatchStatementBuilder addStatement(@NonNull BatchableStatement<?> statement) {
      if (statementsCount >= 0xFFFF) {
        throw new IllegalStateException(
            "Batch statement cannot contain more than " + 0xFFFF + " statements.");
      }
      statementsCount += 1;
      statementsBuilder.add(statement);
      return this;
    }