public Builder mergeUpdateMask(com.google.protobuf.FieldMask value) {
      if (updateMaskBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && updateMask_ != null
            && updateMask_ != com.google.protobuf.FieldMask.getDefaultInstance()) {
          getUpdateMaskBuilder().mergeFrom(value);
        } else {
          updateMask_ = value;
        }
      } else {
        updateMaskBuilder_.mergeFrom(value);
      }
      if (updateMask_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
The list of fields to be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UpdateDataSchemaRequest.java