@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output)
                        throws java.io.IOException {
      if (((bitField0_ & 0x00000001) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 1, key_);
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 2, value_);
      }
      getUnknownFields().writeTo(output);
    }
<code>optional string value = 2;</code>
@return The bytes for value.
ql/src/gen/protobuf/gen-test/org/apache/hadoop/hive/ql/io/protobuf/SampleProtos.java