要使用PySpark中的to_timestamp函数将字符串'2022-12-07050641'转换为时间戳，可以使用正则表达式提取字符串的日期和时间部分，然后使用to_timestamp函数将它们转换为时间戳。

import re
from pyspark.sql.functions import to_timestamp, regexp_extract

# Define the regular expression pattern to extract the date and time parts
pattern = r'(\d{4}-\d{2}-\d{2})(\d{6})'

# Extract the date and time parts using the regular expression
df = df.withColumn('date', regexp_extract('string_column', pattern, 1))
df = df.withColumn('time', regexp_extract('string_column', pattern, 2))

# Convert the date and time parts to a timestamp
df = df.withColumn('timestamp', to_timestamp(df['date'] + ' ' + df['time'], 'yyyy-MM-dd HHmmss'))

# Drop the date and time columns
df = df.drop('date').drop('time')