code: def time_read(self, num_cols):
      pq.read_table(self.buf)
  
imports: import shutil
  import tempfile
  from pandas.util.testing import rands
  import numpy
  import pandas
  import pyarrow
label_desc: Use image node_id 3 for calling the ParquetManyColumns obj's underlying member method code with example usage: obj.time_read(num_cols) without return types