>>> df = session.create_dataframe([83, 33, 169, 8364, None], schema=['a'])
>>> df.select(df.a, char(df.a).as_('char')).sort(df.a).show()
-----------------
|"A" |"CHAR" |
-----------------
|NULL |NULL |
|33 |! |
|83 |S |
|169 |© |
|8364 |€ |
-----------------