Od_input['input'].get_as_pandas() in Python Processor is not loading column for dataframe

Dear OneData users,
have you encountered a problem that a python processor doesn’t load columns with their name?
I’m using “od_input[‘input’].get_as_pandas()” to get a pandas dataframe but it somehow only contains values and no column names.

It seems that it’s just that print I did to see columns just runs somehow after the script already failed in later step. The column header itself was there (I could find it out be commenting out the part that caused problem).