org.apache.flink.table.runtime.conversion.CRowToScalaTupleMapRunner.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.

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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.runtime.conversion

import org.apache.flink.api.common.functions.{MapFunction, RichMapFunction}
import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.api.java.typeutils.ResultTypeQueryable
import org.apache.flink.configuration.Configuration
import org.apache.flink.table.codegen.Compiler
import org.apache.flink.table.runtime.types.CRow
import org.apache.flink.table.util.Logging
import org.apache.flink.types.Row

/**
  * Convert [[CRow]] to a [[Tuple2]].
  */
class CRowToScalaTupleMapRunner(
  name: String,
  code: String,
  @transient var returnType: TypeInformation[(Boolean, Any)])
  extends RichMapFunction[CRow, (Boolean, Any)]
  with ResultTypeQueryable[(Boolean, Any)]
  with Compiler[MapFunction[Row, Any]]
  with Logging {

  private var function: MapFunction[Row, Any] = _

  override def open(parameters: Configuration): Unit = {
    LOG.debug(s"Compiling MapFunction: $name \n\n Code:\n$code")
    val clazz = compile(getRuntimeContext.getUserCodeClassLoader, name, code)
    LOG.debug("Instantiating MapFunction.")
    function = clazz.newInstance()
  }

  override def map(in: CRow): (Boolean, Any) =
    (in.change, function.map(in.row))

  override def getProducedType: TypeInformation[(Boolean, Any)] = returnType
}