scala

来源： https://stackoverflow.com/questions/35758131/create-unnamed-implicit-class-or-function

来源： https://stackoverflow.com/questions/62682390/disambiguate-constructor-parameter-with-same-name-as-class-field-of-superclass

来源： https://stackoverflow.com/questions/62682390/disambiguate-constructor-parameter-with-same-name-as-class-field-of-superclass

问题 I am trying to read datas from Elasticsearch, but the document I want to read contains a nested array (that I want to read). I included the option "es.read.field.as.array.include" in the following way : val dataframe = reader .option("es.read.field.as.array.include","arrayField") .option("es.query", "someQuery") .load("Index/Document") But got the error java.lang.ClassCastException: scala.collection.convert.Wrappers$JListWrapper cannot be cast to java.lang.Float How should I map my array to

问题 I had a fallowing snippet of code in scala-js(0.6.33) object Main2 extends App { val js = for { jsTest <- JSTest.js1.toOption } yield jsTest println(JSTest.js1) } import scala.scalajs.js import scala.scalajs.js.annotation.JSGlobalScope @js.native @JSGlobalScope object JSTest extends js.Object { def js1: js.UndefOr[JS2] = js.native } @js.native trait JS1 extends js.Object { def js1: js.UndefOr[JS2] = js.native } @js.native trait JS2 extends js.Object { def js2: js.UndefOr[Int] = js.native }

问题 In my play application i intend to mock a case class. I am able to do so but it creates an object with all member variables null. Is there a way to create mock objects of a case classes such that the object can have some members initialized? case class User(name: String, address: String) val mockUser = mock[User] user.name // null user.address //null how do i create a mockUser such that i can assign some values to name and address? Edit: I need the ability to mock the object because i want to

问题 In my play application i intend to mock a case class. I am able to do so but it creates an object with all member variables null. Is there a way to create mock objects of a case classes such that the object can have some members initialized? case class User(name: String, address: String) val mockUser = mock[User] user.name // null user.address //null how do i create a mockUser such that i can assign some values to name and address? Edit: I need the ability to mock the object because i want to

问题 I have a Dataset that i created from a RDD and try to join it with another Dataset which is created from my Phoenix Table : val dfToJoin = sparkSession.createDataset(rddToJoin) val tableDf = sparkSession .read .option("table", "table") .option("zkURL", "localhost") .format("org.apache.phoenix.spark") .load() val joinedDf = dfToJoin.join(tableDf, "columnToJoinOn") When i execute it, it seems that the whole database table is loaded to do the join. Is there a way to do such a join so that the

问题 I have a Dataset that i created from a RDD and try to join it with another Dataset which is created from my Phoenix Table : val dfToJoin = sparkSession.createDataset(rddToJoin) val tableDf = sparkSession .read .option("table", "table") .option("zkURL", "localhost") .format("org.apache.phoenix.spark") .load() val joinedDf = dfToJoin.join(tableDf, "columnToJoinOn") When i execute it, it seems that the whole database table is loaded to do the join. Is there a way to do such a join so that the

问题 I have a Dataset that i created from a RDD and try to join it with another Dataset which is created from my Phoenix Table : val dfToJoin = sparkSession.createDataset(rddToJoin) val tableDf = sparkSession .read .option("table", "table") .option("zkURL", "localhost") .format("org.apache.phoenix.spark") .load() val joinedDf = dfToJoin.join(tableDf, "columnToJoinOn") When i execute it, it seems that the whole database table is loaded to do the join. Is there a way to do such a join so that the