Unable to parse uid and pad fields 【BUG】

[hcymysql]

>>> from sql_metadata import Parser
>>> sql2 = "select * from t1 where uid = 4"
>>> parser = Parser(sql2)
>>> data = parser.columns_dict
>>> print(data)
{'select': ['*']}

>>> from sql_metadata import Parser
>>> sql2 = "select * from t1 where `uid` = 4"
>>> parser = Parser(sql2)
>>> data = parser.columns_dict
print(data)>>> print(data)
{'select': ['*'], 'where': ['uid']}

>>> from sql_metadata import Parser
>>> sql2 = "select * from t1 where pad = 4"
>>> parser = Parser(sql2)
>>> data = parser.columns_dict
>>> print(data)
{'select': ['*']}