Not support rename DataFrame.columns assigning directly.

[itholic]

when rename columns of DataFrame,

pandas are supporting below way,

>>> pdf = pd.DataFrame({
...             'a': [1, 2, 3, 4, 5, 6, 7, 8, 9],
...             'b': [4, 5, 6, 3, 2, 1, 0, 0, 0]
...         }, index=[0, 1, 3, 5, 6, 8, 9, 9, 9])

>>> pdf.columns
Index(['a', 'b'], dtype='object')

>>> pdf.columns.name = 'column_renamed'

>>> pdf.columns
Index(['a', 'b'], dtype='object', name='column_renamed')

but koalas not.

>>> kdf = ks.DataFrame({
...             'a': [1, 2, 3, 4, 5, 6, 7, 8, 9],
...             'b': [4, 5, 6, 3, 2, 1, 0, 0, 0]
...         }, index=[0, 1, 3, 5, 6, 8, 9, 9, 9])

>>> kdf.columns
Index(['a', 'b'], dtype='object')

>>> kdf.columns.name = 'column_renamed'

>>> kdf.columns
Index(['a', 'b'], dtype='object')

[itholic]

FYI.

koalas can change name of columns like this,

>>> kdf.columns = kdf.columns.rename('column_renamed')

or like that

>>> tmp_columns = kdf.columns
>>> tmp_columns.name = 'column_renamed'
>>> kdf.columns = tmp_columns

but i think both ways are complicated than below

kdf.columns.name = 'column_renamed'