@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    DeleteResult record = (DeleteResult) o;
    return Objects.equals(blobVersions, record.blobVersions);
  }
Return the list of blob ids that were deleted in a comma separated string. If there is no blob ids, then
an empty string would be returned.
@return
ambry-api/src/main/java/com/github/ambry/named/DeleteResult.java