# -*- coding: utf-8 -*-
"""
Created on Wed Sep  4 17:15:36 2024

@author: Yu-Chen Wang

Data operations
"""

def vstack():
    # TODO: doing "vstack" on Data may need to be forbidden; vstack Table instead
    # subsets should be removed after vstack
    raise NotImplementedError()

def hstack():
    # TODO
    # in this case, IdentityMatcher may be used.
    raise NotImplementedError()
