Scala Spark：将数据框中的双列转换为日期时间列

Question

我正在尝试编写代码以将日期时间列 date 和 last_updated_date 转换为“mm-dd-yyyy”格式以显示。我该怎么做呢 ？

import org.joda.time._
import scala.tools._
import org.joda.time.format.DateTimeFormat._
import java.text.SimpleDateFormat
import org.apache.spark.sql.functions.{unix_timestamp, to_date}
root
 |-- date: double (nullable = false)
 |-- last_updated_date: double (nullable = false)
 |-- Percent_Used: double (nullable = false)

+------------+---------------------+------------+
|        date|    last_updated_date|Percent_Used|
+------------+---------------------+------------+
| 1.453923E12|        1.47080394E12| 1.948327124|
|1.4539233E12|        1.47080394E12| 2.019636442|
|1.4539236E12|        1.47080394E12| 1.995299371|
+------------+---------------------+------------+

Answer 1

投射到时间戳：

df.select(col("date").cast("timestamp"));