code: def test_hyper_to_pa_vanilla(self):
      df = pd.DataFrame({"x": ["a", "b", "c"], "y": ["d", "e", "f"]})
  
      hg = graphistry.hypergraph(df)
      nodes_arr = pa.Table.from_pandas(hg["graph"]._nodes)
      assert len(nodes_arr) == 9
      edges_err = pa.Table.from_pandas(hg["graph"]._edges)
      assert len(edges_err) == 6
  
imports: import datetime, logging, pandas, pyarrow
  import pytest
  import graphistry, graphistry.plotter
  from common import NoAuthTestCase
label_desc: Use image node_id 11 for calling the TestHypergraphPlain obj's underlying member method code with example usage: obj.test_hyper_to_pa_vanilla() without return types