public Builder clear() {
        super.clear();
        index_ = 0;
        bitField0_ = (bitField0_ & ~0x00000001);
        name_ = "";
        bitField0_ = (bitField0_ & ~0x00000002);
        value_ = "";
        bitField0_ = (bitField0_ & ~0x00000004);
        isPrimaryKey_ = false;
        bitField0_ = (bitField0_ & ~0x00000008);
        isNull_ = false;
        bitField0_ = (bitField0_ & ~0x00000010);
        type_ = 0;
        bitField0_ = (bitField0_ & ~0x00000020);
        isUpdate_ = false;
        bitField0_ = (bitField0_ & ~0x00000040);
        return this;
      }
Protobuf type {@code com.alibaba.otter.node.etl.model.protobuf.Column}
node/etl/src/main/java/com/alibaba/otter/node/etl/model/protobuf/BatchProto.java