聊聊flink Table的Set Operations

序

本文主要研究一下flink Table的Set Operations

实例

Union

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "a, b, c");
Table result = left.union(right);
  • union方法类似sql的union

UnionAll

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "a, b, c");
Table result = left.unionAll(right);
  • unionAll方法类似sql的union all

Intersect

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "d, e, f");
Table result = left.intersect(right);
  • intersect方法类似sql的intersect

IntersectAll

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "d, e, f");
Table result = left.intersectAll(right);
  • intersectAll方法类似sql的intersect all

Minus

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "a, b, c");
Table result = left.minus(right);
  • minus方法类似sql的except

MinusAll

Table left = tableEnv.fromDataSet(ds1, "a, b, c");
Table right = tableEnv.fromDataSet(ds2, "a, b, c");
Table result = left.minusAll(right);
  • minusAll方法类似sql的except all

In

Table left = ds1.toTable(tableEnv, "a, b, c");
Table right = ds2.toTable(tableEnv, "a");

// using implicit registration
Table result = left.select("a, b, c").where("a.in(" + right + ")");

// using explicit registration
tableEnv.registerTable("RightTable", right);
Table result = left.select("a, b, c").where("a.in(RightTable)");
  • in方法类似sql的in

Table

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/api/table.scala

class Table(
    private[flink] val tableEnv: TableEnvironment,
    private[flink] val logicalPlan: LogicalNode) {

  //......

  def union(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException("Only tables from the same TableEnvironment can be unioned.")
    }
    new Table(tableEnv, Union(logicalPlan, right.logicalPlan, all = false).validate(tableEnv))
  }

  def unionAll(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException("Only tables from the same TableEnvironment can be unioned.")
    }
    new Table(tableEnv, Union(logicalPlan, right.logicalPlan, all = true).validate(tableEnv))
  }

  def intersect(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException(
        "Only tables from the same TableEnvironment can be intersected.")
    }
    new Table(tableEnv, Intersect(logicalPlan, right.logicalPlan, all = false).validate(tableEnv))
  }

  def intersectAll(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException(
        "Only tables from the same TableEnvironment can be intersected.")
    }
    new Table(tableEnv, Intersect(logicalPlan, right.logicalPlan, all = true).validate(tableEnv))
  }

  def minus(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException("Only tables from the same TableEnvironment can be " +
        "subtracted.")
    }
    new Table(tableEnv, Minus(logicalPlan, right.logicalPlan, all = false)
      .validate(tableEnv))
  }

  def minusAll(right: Table): Table = {
    // check that right table belongs to the same TableEnvironment
    if (right.tableEnv != this.tableEnv) {
      throw new ValidationException("Only tables from the same TableEnvironment can be " +
        "subtracted.")
    }
    new Table(tableEnv, Minus(logicalPlan, right.logicalPlan, all = true)
      .validate(tableEnv))
  }

  //......
}
  • union及unionAll使用的是Union，intersect及intersectAll使用的是Intersect，minus及minusAll使用的是Minus

Union

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/plan/logical/operators.scala

case class Union(left: LogicalNode, right: LogicalNode, all: Boolean) extends BinaryNode {
  override def output: Seq[Attribute] = left.output

  override protected[logical] def construct(relBuilder: RelBuilder): RelBuilder = {
    left.construct(relBuilder)
    right.construct(relBuilder)
    relBuilder.union(all)
  }

  override def validate(tableEnv: TableEnvironment): LogicalNode = {
    if (tableEnv.isInstanceOf[StreamTableEnvironment] && !all) {
      failValidation(s"Union on stream tables is currently not supported.")
    }

    val resolvedUnion = super.validate(tableEnv).asInstanceOf[Union]
    if (left.output.length != right.output.length) {
      failValidation(s"Union two tables of different column sizes:" +
        s" ${left.output.size} and ${right.output.size}")
    }
    val sameSchema = left.output.zip(right.output).forall { case (l, r) =>
      l.resultType == r.resultType
    }
    if (!sameSchema) {
      failValidation(s"Union two tables of different schema:" +
        s" [${left.output.map(a => (a.name, a.resultType)).mkString(", ")}] and" +
        s" [${right.output.map(a => (a.name, a.resultType)).mkString(", ")}]")
    }
    resolvedUnion
  }
}
  • Union继承了BinaryNode，其construct方法通过relBuilder.union来构建union操作

Intersect

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/plan/logical/operators.scala

case class Intersect(left: LogicalNode, right: LogicalNode, all: Boolean) extends BinaryNode {
  override def output: Seq[Attribute] = left.output

  override protected[logical] def construct(relBuilder: RelBuilder): RelBuilder = {
    left.construct(relBuilder)
    right.construct(relBuilder)
    relBuilder.intersect(all)
  }

  override def validate(tableEnv: TableEnvironment): LogicalNode = {
    if (tableEnv.isInstanceOf[StreamTableEnvironment]) {
      failValidation(s"Intersect on stream tables is currently not supported.")
    }

    val resolvedIntersect = super.validate(tableEnv).asInstanceOf[Intersect]
    if (left.output.length != right.output.length) {
      failValidation(s"Intersect two tables of different column sizes:" +
        s" ${left.output.size} and ${right.output.size}")
    }
    // allow different column names between tables
    val sameSchema = left.output.zip(right.output).forall { case (l, r) =>
      l.resultType == r.resultType
    }
    if (!sameSchema) {
      failValidation(s"Intersect two tables of different schema:" +
        s" [${left.output.map(a => (a.name, a.resultType)).mkString(", ")}] and" +
        s" [${right.output.map(a => (a.name, a.resultType)).mkString(", ")}]")
    }
    resolvedIntersect
  }
}
  • Intersect继承了BinaryNode，其construct方法通过relBuilder.intersect来构建intersect操作

Minus

flink-table_2.11-1.7.0-sources.jar!/org/apache/flink/table/plan/logical/operators.scala

case class Minus(left: LogicalNode, right: LogicalNode, all: Boolean) extends BinaryNode {
  override def output: Seq[Attribute] = left.output

  override protected[logical] def construct(relBuilder: RelBuilder): RelBuilder = {
    left.construct(relBuilder)
    right.construct(relBuilder)
    relBuilder.minus(all)
  }

  override def validate(tableEnv: TableEnvironment): LogicalNode = {
    if (tableEnv.isInstanceOf[StreamTableEnvironment]) {
      failValidation(s"Minus on stream tables is currently not supported.")
    }

    val resolvedMinus = super.validate(tableEnv).asInstanceOf[Minus]
    if (left.output.length != right.output.length) {
      failValidation(s"Minus two table of different column sizes:" +
        s" ${left.output.size} and ${right.output.size}")
    }
    val sameSchema = left.output.zip(right.output).forall { case (l, r) =>
      l.resultType == r.resultType
    }
    if (!sameSchema) {
      failValidation(s"Minus two table of different schema:" +
        s" [${left.output.map(a => (a.name, a.resultType)).mkString(", ")}] and" +
        s" [${right.output.map(a => (a.name, a.resultType)).mkString(", ")}]")
    }
    resolvedMinus
  }
}
  • Minus继承了BinaryNode，其construct方法通过relBuilder.minus来构建minus操作

小结

  • Table对Set提供了union、unionAll、intersect、intersectAll、minus、minusAll、in(in在where子句中)操作
  • union及unionAll使用的是Union，intersect及intersectAll使用的是Intersect，minus及minusAll使用的是Minus
  • Union继承了BinaryNode，其construct方法通过relBuilder.union来构建union操作；Intersect继承了BinaryNode，其construct方法通过relBuilder.intersect来构建intersect操作；Minus继承了BinaryNode，其construct方法通过relBuilder.minus来构建minus操作

doc

©著作权归作者所有,转载或内容合作请联系作者
  • 人面猴
    序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
    沈念sama阅读 205,386评论 6赞 479
  • 死咒
    序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
    沈念sama阅读 87,939评论 2赞 381
  • 救了他两次的神仙让他今天三更去死
    文/潘晓璐 我一进店门，熙熙楼的掌柜王于贵愁眉苦脸地迎上来，“玉大人，你说我怎么就摊上这事。” “怎么了？”我有些...
    开封第一讲书人阅读 151,851评论 0赞 341
  • 道士缉凶录：失踪的卖姜人
    文/不坏的土叔 我叫张陵，是天一观的道长。 经常有香客问我，道长，这世上最难降的妖魔是什么？ 我笑而不...
    开封第一讲书人阅读 54,953评论 1赞 278
  • 港岛之恋（遗憾婚礼）
    正文 为了忘掉前任，我火速办了婚礼，结果婚礼上，老公的妹妹穿的比我还像新娘。我一直安慰自己，他们只是感情好，可当我...
    茶点故事阅读 63,971评论 5赞 369
  • 恶毒庶女顶嫁案：这布局不是一般人想出来的
    文/花漫 我一把揭开白布。 她就那样静静地躺着，像睡着了一般。 火红的嫁衣衬着肌肤如雪。 梳的纹丝不乱的头发上，一...
    开封第一讲书人阅读 48,784评论 1赞 283
  • 城市分裂传说
    那天，我揣着相机与录音，去河边找鬼。 笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。 我是一名探鬼主播，决...
    沈念sama阅读 38,126评论 3赞 399
  • 双鸳鸯连环套：你想象不到人心有多黑
    文/苍兰香墨 我猛地睁开眼，长吁一口气：“原来是场噩梦啊……” “哼！你这毒妇竟也来了？” 一声冷哼从身侧响起，我...
    开封第一讲书人阅读 36,765评论 0赞 258
  • 万荣杀人案实录
    序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
    沈念sama阅读 43,148评论 1赞 300
  • 护林员之死
    正文 独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋 以下内容为张勋视角 年9月15日...
    茶点故事阅读 35,744评论 2赞 323
  • 白月光启示录
    正文 我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。 大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
    茶点故事阅读 37,858评论 1赞 333
  • 活死人
    序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
    沈念sama阅读 33,479评论 4赞 322
  • 日本核电站爆炸内幕
    正文 年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
    茶点故事阅读 39,080评论 3赞 307
  • 男人毒药：我在死后第九天来索命
    文/蒙蒙 一、第九天 我趴在偏房一处隐蔽的房顶上张望。 院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
    开封第一讲书人阅读 30,053评论 0赞 19
  • 一桩弑父案，背后竟有这般阴谋
    文/苍兰香墨 我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。 一阵脚步声响...
    开封第一讲书人阅读 31,278评论 1赞 260
  • 情欲美人皮
    我被黑心中介骗来泰国打工， 没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。 一个月前我还...
    沈念sama阅读 45,245评论 2赞 352
  • 代替公主和亲
    正文 我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。 传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
    茶点故事阅读 42,590评论 2赞 343

推荐阅读更多精彩内容