自定义聚合函数(统计每种行为的触发次数排名前三的商品id)
2022/9/5 23:54:09
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package SparkSQL.fun.project import org.apache.spark.SparkConf import org.apache.spark.sql.expressions.{MutableAggregationBuffer, UserDefinedAggregateFunction} import org.apache.spark.sql.types.{DataType, DataTypes, StructField, StructType} import org.apache.spark.sql.{DataFrame, Dataset, Row, SparkSession} /** * 统计每种行为的触发次数排名前三的商品id */ object BehaviorCode2 { def main(args: Array[String]): Unit = { val sparkConf = new SparkConf().setAppName("project01").setMaster("local[*]") val session = SparkSession.builder().config(sparkConf).getOrCreate() val map = Map("mode"->"dropMalformed","inferSchema"->"true") val frame = session.read.options(map).csv("G:\\shixunworkspace\\sparkcode\\src\\main\\java\\SparkSQL\\fun\\project\\b.csv") // "userId", "goodsId", "categoryId", "behavior", "time" import session.implicits._ val frame1: Dataset[UserBehaviorBean] = frame.map(row => { UserBehaviorBean(row.getInt(0), row.getInt(1), row.getInt(2), row.getString(3), row.getInt(4)) }) val frame3 = frame1.toDF("userId", "goodsId", "categoryId", "behavior", "time") frame3.createTempView("tmp") val frame2 = session.sql("select behavior, goodsId, count(*) count from tmp group by behavior, goodsId") frame2.show() frame2.createTempView("tmp1") val frame4 = session.sql("select behavior, goodsId, count, row_number() over(partition by behavior, goodsId order by count) rn from tmp1") frame4.show() frame4.createTempView("temp2") val frame5 = session.sql("select behavior, goodsId, count, rn from temp2 where rn <= 3") frame5.show() session.stop() } }
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