public Builder mergeDefaultValue(com.google.cloud.visionai.v1.AttributeValue value) {
        if (defaultValueBuilder_ == null) {
          if (((bitField0_ & 0x00000004) != 0)
              && defaultValue_ != null
              && defaultValue_
                  != com.google.cloud.visionai.v1.AttributeValue.getDefaultInstance()) {
            getDefaultValueBuilder().mergeFrom(value);
          } else {
            defaultValue_ = value;
          }
        } else {
          defaultValueBuilder_.mergeFrom(value);
        }
        if (defaultValue_ != null) {
          bitField0_ |= 0x00000004;
          onChanged();
        }
        return this;
      }
<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