code: def get_test_data():
      df = pd._testing.makeMixedDataFrame()
      df["date"] = df["D"].apply(lambda x: pd.to_datetime(x).value)
      return df
  
file_path: popmon/tests/popmon/hist/test_histogram.py
imports: import histogrammar
  import numpy
  import pandas
  from popmon.hist.hist_utils import is_numeric, is_timestamp, project_on_x, project_split2dhist_on_axis, sparse_bin_centers_x, split_hist_along_first_dimension, sum_entries, sum_over_x
label_desc: Use image node_id 1 for calling a global function with example usage: get_test_data() and returns: df