class_docstr: This plan is used for storing information required for load data
  operations.
  
  Arguments:
      table(TableCatalogEntry): table to load into
      file_path(Path): file path from where we will load the data
      batch_mem_size(int): memory size of the batch loaded from disk
code: def column_list(self):
      return self._column_list
  
file_path: evadb/evadb/plan_nodes/load_data_plan.py
imports: from pathlib import Path
  from typing import List
  from evadb.expression.abstract_expression import AbstractExpression
  from evadb.parser.table_ref import TableInfo
  from evadb.plan_nodes.abstract_plan import AbstractPlan
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 5 for calling the LoadDataPlan obj's underlying member method code with example usage: obj.column_list() and returns: self