public Builder mergePosition(com.google.cloud.vision.v1p4beta1.Position value) {
        if (positionBuilder_ == null) {
          if (((bitField0_ & 0x00000002) != 0)
              && position_ != null
              && position_ != com.google.cloud.vision.v1p4beta1.Position.getDefaultInstance()) {
            getPositionBuilder().mergeFrom(value);
          } else {
            position_ = value;
          }
        } else {
          positionBuilder_.mergeFrom(value);
        }
        if (position_ != null) {
          bitField0_ |= 0x00000002;
          onChanged();
        }
        return this;
      }
<pre>
Face landmark position.
</pre>

<code>.google.cloud.vision.v1p4beta1.Position position = 4;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/FaceAnnotation.java