In the code below.

What role does unix_timestamp function play in this date conversion?Where did the "dd/MMM/yyy...." string come from?

What is the significance of the final call to cast?

import re

from pyspark.sql.types import *

from pyspark.sql.functions import *

inputPath = "/databricks-datasets/sample_logs/"

df = sqlContext.read.text(inputPath)

#converted = df.select(unix_timestamp(regexp_extract(df["value"], ".+\[(.+) -", 1), "dd/MMM/yyyy:HH:mm:ss") \

#.cast(TimestampType()),

#split(df["value"], "")[8])

#display(converted.take(10))