在将Python数据帧写入AWS红移时，DataError-值对于类型字符变化（256）而言太长

Question

我正在尝试将Python数据框写入redshift。我写了这段代码 -

df.to_sql('df', redshiftEngine, index = False, if_exists = 'replace')
redshiftENgine = create_engine('skipping the details')

我收到以下错误：

DataError: value too long for type character varying(256)

进一步深入研究sqalchemy文档，我发现了这个：

Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range, etc.This error is a DBAPI Error and originates from the database driver (DBAPI), not SQLAlchemy itself.

但我仍然不确定如何处理这个错误。我有300多列和3000多行。

以前有人遇到过这个吗？