public Builder mergeDatetimeBucketSpec(
        com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec value) {
      if (datetimeBucketSpecBuilder_ == null) {
        if (rangeFacetConfigCase_ == 7
            && rangeFacetConfig_
                != com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec
                    .getDefaultInstance()) {
          rangeFacetConfig_ =
              com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec.newBuilder(
                      (com.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec)
                          rangeFacetConfig_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          rangeFacetConfig_ = value;
        }
        onChanged();
      } else {
        if (rangeFacetConfigCase_ == 7) {
          datetimeBucketSpecBuilder_.mergeFrom(value);
        } else {
          datetimeBucketSpecBuilder_.setMessage(value);
        }
      }
      rangeFacetConfigCase_ = 7;
      return this;
    }
<pre>
Datetime range facet bucket config.
</pre>

<code>.google.cloud.visionai.v1.FacetProperty.DateTimeBucketSpec datetime_bucket_spec = 7;
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetProperty.java