public Builder addRows(
          int index, main.Messages.TableRow.Builder builderForValue) {
        if (rowsBuilder_ == null) {
          ensureRowsIsMutable();
          rows_.add(index, builderForValue.build());
          onChanged();
        } else {
          rowsBuilder_.addMessage(index, builderForValue.build());
        }
        return this;
      }