private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.visionai.v1.FacetValue,
              com.google.cloud.visionai.v1.FacetValue.Builder,
              com.google.cloud.visionai.v1.FacetValueOrBuilder>
          getStartFieldBuilder() {
        if (startBuilder_ == null) {
          startBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.visionai.v1.FacetValue,
                  com.google.cloud.visionai.v1.FacetValue.Builder,
                  com.google.cloud.visionai.v1.FacetValueOrBuilder>(
                  getStart(), getParentForChildren(), isClean());
          start_ = null;
        }
        return startBuilder_;
      }
<pre>
Start of the range. Non-existence indicates some bound (e.g. -inf).
</pre>

<code>.google.cloud.visionai.v1.FacetValue start = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/FacetBucket.java