public Builder mergeValue(com.google.cloud.visionai.v1.FacetValue value) {
      if (valueBuilder_ == null) {
        if (bucketValueCase_ == 2
            && bucketValue_ != com.google.cloud.visionai.v1.FacetValue.getDefaultInstance()) {
          bucketValue_ =
              com.google.cloud.visionai.v1.FacetValue.newBuilder(
                      (com.google.cloud.visionai.v1.FacetValue) bucketValue_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          bucketValue_ = value;
        }
        onChanged();
      } else {
        if (bucketValueCase_ == 2) {
          valueBuilder_.mergeFrom(value);
        } else {
          valueBuilder_.setMessage(value);
        }
      }
      bucketValueCase_ = 2;
      return this;
    }
<pre>
Singular value.
</pre>

<code>.google.cloud.visionai.v1.FacetValue value = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetBucket.java