我需要装货 jalali 从字符串中选择日期，然后作为 gregorian 日期字符串。我使用以下代码：

def jalali_to_gregorian(col, format=None):
    if not format:
        format = "%Y/%m/d"
    gre = jdatetime.datetime.strptime(col, format=format).togregorian()
    return gre.strftime(format=format)

# register the function

spark.udf.register("jalali_to_gregorian", jalali_to_gregorian, StringType())

# load the date and show it:)

df = df.withColumn("financial_date", jalali_to_gregorian(df.PersianCreateDate))
df.select(['PersianCreateDate', 'financial_date']).show()

它抛出 ValueError: time data 'Column<PersianCreateDate>' does not match format '%Y/%m/%d' 我犯了个错误。列中的字符串是匹配的，我已经测试过了。这是spark如何将列值发送到函数的问题。怎么解决呢？
要测试：

df=spark.createDataFrame([('1399/01/02',),('1399/01/01',)],['jalali'])
df = df.withColumn("gre", jalali_to_gregorian(df.jalali))
df.show()

应该导致

+----------+----------+
|    jalali|       gre|
+----------+----------+
|1399/01/02|2020/03/20|
|1399/01/01|2020/03/21|
+----------+----------+

相反，我被扔在：

Fail to execute line 2: df = df.withColumn("financial_date",    jalali_to_gregorian(df.jalali))
Traceback (most recent call last):
File "/tmp/zeppelin_pyspark-6468469233020961307.py", line 375, in <module>
exec(code, _zcUserQueryNameSpace)
File "<stdin>", line 2, in <module>
File "<stdin>", line 7, in jalali_to_gregorian
File "/usr/local/lib/python2.7/dist-packages/jdatetime/__init__.py", line 929, in strptime
(date_string, format))
ValueError: time data 'Column<jalali>' does not match format '%Y/%m/%d''%Y/%m/%d'