flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/physical/stream/StreamExecWatermarkAssigner.scala

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 * distributed with this work for additional information
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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.flink.table.plan.nodes.physical.stream

import org.apache.flink.streaming.api.transformations.{OneInputTransformation, StreamTransformation}
import org.apache.flink.table.api.StreamTableEnvironment
import org.apache.flink.table.calcite.FlinkTypeFactory
import org.apache.flink.table.dataformat.BaseRow
import org.apache.flink.table.plan.nodes.calcite.WatermarkAssigner
import org.apache.flink.table.plan.nodes.exec.RowStreamExecNode
import org.apache.flink.table.plan.nodes.physical.FlinkPhysicalRel
import org.apache.flink.table.runtime.WatermarkAssignerOperator

import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
import org.apache.calcite.rel.RelNode

import java.util

class StreamExecWatermarkAssigner (
    cluster: RelOptCluster,
    traits: RelTraitSet,
    inputNode: RelNode,
    rowtimeField: String,
    watermarkOffset: Long)
  extends WatermarkAssigner(cluster, traits, inputNode, rowtimeField, watermarkOffset)
  with StreamPhysicalRel
  with RowStreamExecNode {

  override def copy(
    traitSet: RelTraitSet,
    inputs: util.List[RelNode]): RelNode = {
    new StreamExecWatermarkAssigner(cluster, traitSet, inputs.get(0), rowtimeField, watermarkOffset)
  }

  override def isDeterministic: Boolean = true

  //~ ExecNode methods -----------------------------------------------------------

  override def getFlinkPhysicalRel: FlinkPhysicalRel = this

  override def translateToPlanInternal(
      tableEnv: StreamTableEnvironment): StreamTransformation[BaseRow] = {
    val inputTransformation = getInputNodes.get(0).translateToPlan(tableEnv)
      .asInstanceOf[StreamTransformation[BaseRow]]

    val rowtimeIndex = getRowType.getFieldNames.indexOf(rowtimeField)
    val watermarkOperator = new WatermarkAssignerOperator(rowtimeIndex, watermarkOffset)

    val transformation = new OneInputTransformation[BaseRow, BaseRow](
        inputTransformation,
        s"WatermarkAssigner(rowtime: $rowtimeField, offset: $watermarkOffset)",
        watermarkOperator,
    FlinkTypeFactory.toInternalBaseRowTypeInfo(getRowType),
      inputTransformation.getParallelism)
    transformation.setResources(getResource.getReservedResourceSpec,
      getResource.getPreferResourceSpec)
    transformation
  }
}