如何在spark-scala数据帧中获取当前本地时间或系统时间？

import org.apache.spark.sql.functions._
import java.time.LocalDateTime

val currentTime = current_timestamp()

val localTime = currentTime.cast("timestamp").as("local_time")

val dfWithLocalTime = df.withColumn("local_time", localTime)

import org.apache.spark.sql.functions._
import java.time.LocalDateTime

val currentTime = current_timestamp()
val localTime = currentTime.cast("timestamp").as("local_time")
val dfWithLocalTime = df.withColumn("local_time", localTime)