public Builder mergeFrom(main.Messages.ProtoTable other) {
        if (other == main.Messages.ProtoTable.getDefaultInstance()) return this;
        if (rowsBuilder_ == null) {
          if (!other.rows_.isEmpty()) {
            if (rows_.isEmpty()) {
              rows_ = other.rows_;
              bitField0_ = (bitField0_ & ~0x00000001);
            } else {
              ensureRowsIsMutable();
              rows_.addAll(other.rows_);
            }
            onChanged();
          }
        } else {
          if (!other.rows_.isEmpty()) {
            if (rowsBuilder_.isEmpty()) {
              rowsBuilder_.dispose();
              rowsBuilder_ = null;
              rows_ = other.rows_;
              bitField0_ = (bitField0_ & ~0x00000001);
              rowsBuilder_ = 
                com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders ?
                   getRowsFieldBuilder() : null;
            } else {
              rowsBuilder_.addAllMessages(other.rows_);
            }
          }
        }
        this.mergeUnknownFields(other.getUnknownFields());
        return this;
      }