private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.visionai.v1.AttributeValue,
              com.google.cloud.visionai.v1.AttributeValue.Builder,
              com.google.cloud.visionai.v1.AttributeValueOrBuilder>
          getDefaultValueFieldBuilder() {
        if (defaultValueBuilder_ == null) {
          defaultValueBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.visionai.v1.AttributeValue,
                  com.google.cloud.visionai.v1.AttributeValue.Builder,
                  com.google.cloud.visionai.v1.AttributeValueOrBuilder>(
                  getDefaultValue(), getParentForChildren(), isClean());
          defaultValue_ = null;
        }
        return defaultValueBuilder_;
      }
<pre>
The default value for the attribute.
</pre>

<code>.google.cloud.visionai.v1.AttributeValue default_value = 3;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OperatorDefinition.java