val spark = SparkSession.builder
.master("local[*]")
.appName("testApp")
.config("spark.sql.warehouse.dir", "file:///c:/tmp/spark-warehouse")
.getOrCreate()
import spark.implicits._
val ds = Seq(("99227100", "42222245", "2018-04-26"),
("99227100", "42222245", "2018-05-01"),
("34011381", "42830849", "2015-12-20"),
("34011381", "42830849", "2016-11-27"),
("34011381", "42830849", "2016-12-19"),
("34011381", "42830849", "2017-08-05")).toDS()
//.toDF("ckey", "twkey", "s_date")
ds.show()
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