org.apache.flink.table.planner.plan.rules.physical.stream.StreamPhysicalPythonCalcRule.scala Maven / Gradle / Ivy

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This module bridges Table/SQL API and runtime. It contains all resources that are required during pre-flight and runtime phase. The content of this module is work-in-progress. It will replace flink-table-planner once it is stable. See FLINK-11439 and FLIP-32 for more details.

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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.planner.plan.rules.physical.stream

import org.apache.calcite.plan.{RelOptRule, RelOptRuleCall, RelTraitSet}
import org.apache.calcite.rel.RelNode
import org.apache.calcite.rel.convert.ConverterRule
import org.apache.flink.table.planner.plan.nodes.FlinkConventions
import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCalc
import org.apache.flink.table.planner.plan.nodes.physical.stream.StreamPhysicalPythonCalc
import org.apache.flink.table.planner.plan.utils.PythonUtil.containsPythonCall

import scala.collection.JavaConverters._

/**
  * Rule that converts [[FlinkLogicalCalc]] to [[StreamPhysicalPythonCalc]].
  */
class StreamPhysicalPythonCalcRule
  extends ConverterRule(
    classOf[FlinkLogicalCalc],
    FlinkConventions.LOGICAL,
    FlinkConventions.STREAM_PHYSICAL,
    "StreamPhysicalPythonCalcRule") {

  override def matches(call: RelOptRuleCall): Boolean = {
    val calc: FlinkLogicalCalc = call.rel(0)
    val program = calc.getProgram
    program.getExprList.asScala.exists(containsPythonCall(_))
  }

  def convert(rel: RelNode): RelNode = {
    val calc: FlinkLogicalCalc = rel.asInstanceOf[FlinkLogicalCalc]
    val traitSet: RelTraitSet = rel.getTraitSet.replace(FlinkConventions.STREAM_PHYSICAL)
    val newInput = RelOptRule.convert(calc.getInput, FlinkConventions.STREAM_PHYSICAL)

    new StreamPhysicalPythonCalc(
      rel.getCluster,
      traitSet,
      newInput,
      calc.getProgram,
      rel.getRowType)
  }
}

object StreamPhysicalPythonCalcRule {
  val INSTANCE: RelOptRule = new StreamPhysicalPythonCalcRule
}