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WatermarkAssigner.scala
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WatermarkAssigner.scala
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.table.plan.nodes.calcite
import org.apache.flink.table.calcite.FlinkTypeFactory
import org.apache.calcite.plan.{RelOptCluster, RelTraitSet}
import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeFieldImpl}
import org.apache.calcite.rel.{RelNode, RelWriter, SingleRel}
import scala.collection.JavaConversions._
/**
* Relational operator that generates [[org.apache.flink.streaming.api.watermark.Watermark]].
*/
abstract class WatermarkAssigner(
cluster: RelOptCluster,
traits: RelTraitSet,
inputRel: RelNode,
val rowtimeFieldIndex: Option[Int],
val watermarkDelay: Option[Long])
extends SingleRel(cluster, traits, inputRel) {
override def deriveRowType(): RelDataType = {
val inputRowType = inputRel.getRowType
val typeFactory = cluster.getTypeFactory.asInstanceOf[FlinkTypeFactory]
val newFieldList = inputRowType.getFieldList.map { f =>
rowtimeFieldIndex match {
case Some(index) if f.getIndex == index =>
val rowtimeIndicatorType = typeFactory.createRowtimeIndicatorType()
new RelDataTypeFieldImpl(f.getName, f.getIndex, rowtimeIndicatorType)
case _ => f
}
}
val builder = typeFactory.builder
builder.addAll(newFieldList)
builder.build()
}
override def explainTerms(pw: RelWriter): RelWriter = {
super.explainTerms(pw)
.item("fields", getRowType.getFieldNames.mkString(", "))
.itemIf("rowtimeField", getRowType.getFieldNames.get(rowtimeFieldIndex.getOrElse(0)),
rowtimeFieldIndex.isDefined)
.itemIf("watermarkDelay", watermarkDelay.getOrElse(0L), watermarkDelay.isDefined)
}
}