class_docstr: ParquetIOTensor
class_docstr_tok: ["ParquetIOTensor"]
docstr: The names of columns
docstr_tok: ["The","names","of","columns"]
code: def columns(self):
      """The names of columns"""
      return self._columns
  
file_path: io/tensorflow_io/python/ops/parquet_io_tensor_ops.py
imports: import tensorflow
  from tensorflow_io.python.ops import io_tensor_ops
  from tensorflow_io.python.ops import core_ops
label_desc: Use image node_id 2 for calling the ParquetIOTensor obj's underlying member method code with example usage: obj.columns() and returns: self