date   time    content

28may  11am    [ssid][customerid,shopid]

val personDF2 = personDF.withColumn("temp",split(col("content"),"\[")).select(
  col("*") +: (0 until 3).map(i => col("temp").getItem(i).as(s/col$i)): _*)

date time   content                       col1   col2        col3

28may 11    [ssid][customerid]            ssid   customerid   shopid