BUG: pandas.testing.assert_frame_equal with check_dtype=False unexpectedly raises an exception

[augustin-barillec]

This code

import pandas
from datetime import datetime
df1 = pandas.DataFrame({'a': []}) 
df2 = pandas.DataFrame({'a': []})
df1['a'] = pandas.to_datetime(df1['a'])
pandas.testing.assert_frame_equal(df1, df2, check_dtype=False)

raises:

AssertionError: right is not an ExtensionArray

But should it raise instead no exception as df1 and df2 are identical, except for their dtypes ?

[arw2019]

I think you're right, will look

[ssortman]

Hi. I'm new and looking to help out on this project! Is this an issue that I'd be able to pick up and work on?

[augustin-barillec]

Thanks !