public Builder mergePartition(com.google.cloud.visionai.v1.Partition value) {
      if (partitionBuilder_ == null) {
        if (((bitField0_ & 0x00000004) != 0)
            && partition_ != null
            && partition_ != com.google.cloud.visionai.v1.Partition.getDefaultInstance()) {
          getPartitionBuilder().mergeFrom(value);
        } else {
          partition_ = value;
        }
      } else {
        partitionBuilder_.mergeFrom(value);
      }
      if (partition_ != null) {
        bitField0_ |= 0x00000004;
        onChanged();
      }
      return this;
    }
<pre>
Partition information in time and space for the sub-asset level annotation.
</pre>

<code>.google.cloud.visionai.v1.Partition partition = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UserSpecifiedAnnotation.java