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);
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• 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);
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• 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);
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• 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);
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• 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);
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• 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);
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• 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)");
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• 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))
  }

  //......
}
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• 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
  }
}
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• 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
  }
}
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• 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
  }
}
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• 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

• Set Operations