@org.apache.thrift.annotation.Nullable
  public java.util.Iterator<java.lang.String> getGroupNamesIterator() {
    return (this.groupNames == null) ? null : this.groupNames.iterator();
  }
Returns true if field userName is set (has been assigned a value) and false otherwise
standalone-metastore/metastore-common/src/gen/thrift/gen-javabean/org/apache/hadoop/hive/metastore/api/GetPartitionsPsWithAuthRequest.java