public Builder setStart(com.google.cloud.visionai.v1.FacetValue.Builder builderForValue) {
        if (startBuilder_ == null) {
          start_ = builderForValue.build();
        } else {
          startBuilder_.setMessage(builderForValue.build());
        }
        bitField0_ |= 0x00000001;
        onChanged();
        return this;
      }
<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