[HOPSWORKS-3135][APPEND] explicit provenance - feature groups, feature views, training datasets (logicalclocks#1234)

Author: o-alex

hopsworks-common/src/main/java/io/hops/hopsworks/common/featurestore/featuregroup/stream/StreamFeatureGroupDTO.java

@@ -20,7 +20,6 @@
 import io.hops.hopsworks.common.featurestore.featuregroup.FeaturegroupDTO;
 import io.hops.hopsworks.persistence.entity.featurestore.featuregroup.Featuregroup;
 import io.hops.hopsworks.persistence.entity.featurestore.featuregroup.cached.TimeTravelFormat;
-import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import java.util.List;
 import java.util.Objects;
@@ -33,7 +32,6 @@ public class StreamFeatureGroupDTO extends FeaturegroupDTO {
   private DeltaStreamerJobConf deltaStreamerJobConf;
   private Boolean onlineEnabled = true;
 
-  @XmlElement
   private List<FeaturegroupDTO> parents;
 
   public StreamFeatureGroupDTO() {