docstr: Retrieve n rows from self.records to be used as update data.
docstr_tok: ["Retrieve","n","rows","from","self.records","to","be","used","as","update","data","."]
code: def _get_update_data(self, n=30):
      """Retrieve n rows from self.records to be used as update data."""
      return SUPERSTORE_ARROW_DATA
  
imports: import os
  from functools import partial
  from bench import Benchmark, Suite, Runner
  from perspective import Table
  import perspective
  import logging
label_desc: Use image node_id 2 for calling the PerspectiveBenchmark obj's underlying member method code with example usage: obj._get_update_data(n) and returns: SUPERSTORE_ARROW_DATA