我认为这是你在找什么。
val spark =SparkSession.builder().master("local").appName("test").getOrCreate()
import spark.implicits._
//create Dataframe 1
val df1 = spark.sparkContext.parallelize(Seq(
("2016-01-01", 1, "abcd", "F"),
("2016-01-01", 2, "efg", "F"),
("2016-01-01", 3, "hij", "F"),
("2016-01-01", 4, "klm", "F")
)).toDF("date","id","value", "label")
//Create Dataframe 2
val df2 = spark.sparkContext.parallelize(Seq(
("2016-01-01", 1, "abcd"),
("2016-01-01", 3, "hij")
)).toDF("date1","id1","value1")
val condition = $"date" === $"date1" && $"id" === $"id1" && $"value" === $"value1"
//Join two dataframe with above condition
val result = df1.join(df2, condition, "left")
// check wather both fields contain same value and drop columns
val finalResult = result.withColumn("label", condition)
.drop("date1","id1","value1")
//Update column label from true false to T or F
finalResult.withColumn("label", when(col("label") === true, "T").otherwise("F")).show
到目前为止你做了些什么,你可以分享吗? –
你使用什么数据框?火花? –
是的,我正在使用火花!感谢答案,两者都有帮助! – Selena