code: public List<Long> deleteRows(long sheetId, Set<Long> rowIds, boolean ignoreRowsNotFound) throws SmartsheetException {
          Util.throwIfNull(rowIds);
          HashMap<String, Object> parameters = new HashMap<String, Object>();
          String path = "sheets/" + sheetId + "/rows/";
          parameters.put("ids", QueryUtil.generateCommaSeparatedList(rowIds));
          parameters.put("ignoreRowsNotFound", ignoreRowsNotFound);
  
          path += QueryUtil.generateUrl(null, parameters);
  
          return this.deleteListResources(path, Long.class);
      }
docs: Deletes one or more row(s) from the Sheet specified in the URL.
  
  It mirrors to the following Smartsheet REST API method: DELETE /sheets/{sheetId}/rows/{rowId}
  Parameters: - id : the ID of the row
  
  Returns: None
  
  Exceptions:
  InvalidRequestException : if there is any problem with the REST API request
  AuthorizationException : if there is any problem with the REST API authorization(access token)
  ResourceNotFoundException : if the resource can not be found
  ServiceUnavailableException : if the REST API service is not available (possibly due to rate limiting)
  SmartsheetRestException : if there is any other REST API related error occurred during the operation
  SmartsheetException : if there is any other error occurred during the operation
  
  @param sheetId the sheet id
  @param rowIds the row ids
  @param ignoreRowsNotFound boolean for ignoring row ids not found
  @return a list of deleted rows
  @throws SmartsheetException the smartsheet exception