我是Scala编程的新手,这是我的问题:如何计算每行的字符串数量？我的Dataframe由一列Array [String]类型组成.
friendsDF: org.apache.spark.sql.DataFrame = [friends: array<string>]
scala apache-spark apache-spark-sql databricks
apache-spark ×1
apache-spark-sql ×1
databricks ×1
scala ×1