code: def test_query_empty_frames():
      empty_pdf = pd.DataFrame({"a": [], "b": []})
      empty_gdf = DataFrame.from_pandas(empty_pdf)
      # Do the query
      expr = "a > 2"
      got = empty_gdf.query(expr).to_pandas()
      expect = empty_pdf.query(expr)
  
      # assert equal results
      assert_eq(got, expect)
  
imports: import datetime
  import inspect
  from itertools import product
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf import DataFrame
  from cudf.testing._utils import assert_eq
  from cudf.utils import queryutils
label_desc: Use image node_id 7 for calling a global function with example usage: test_query_empty_frames() without return types