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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request #3040: [FLINK-3850] Add forward field annotations to Data...
Date Wed, 08 Mar 2017 22:06:31 GMT
Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3040#discussion_r104729449
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/dataset/forwarding/FieldForwardingUtils.scala
---
    @@ -0,0 +1,143 @@
    +/*
    + * 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.dataset.forwarding
    +
    +import org.apache.flink.api.common.typeinfo.{BasicArrayTypeInfo, BasicTypeInfo, TypeInformation
=> TypeInfo}
    +import org.apache.flink.api.common.typeutils.CompositeType
    +import org.apache.flink.api.java.DataSet
    +import org.apache.flink.table.api.TableException
    +import org.apache.flink.types.Row
    +
    +object FieldForwardingUtils {
    +
    +  def compositeTypeField = (fields: Seq[(String, TypeInfo[_])]) => fields
    +
    +  private def throwMissedWrapperException(customWrapper: TypeInfo[_]) = {
    +    throw new TableException(s"Implementation for $customWrapper wrapper is missing.")
    +  }
    +
    +  /**
    +    * Wrapper for {@link getForwardedFields}
    +    */
    +  def getForwardedInput(
    +      inputType: TypeInfo[_],
    +      outputType: TypeInfo[_],
    +      forwardIndices: Seq[Int],
    +      customWrapper: TypeInfo[_] =>
    +        Seq[(String, TypeInfo[_])] = throwMissedWrapperException): String = {
    +
    +    getForwardedFields(inputType,
    +      outputType,
    +      forwardIndices.zip(forwardIndices),
    +      customWrapper)
    +  }
    +
    +  /**
    +    * Wraps provided indices with proper names.
    +    * e.g. _1 for Tuple, f0 for Row, fieldName for POJO and named Row
    +    *
    +    * @param inputType      information of input data
    +    * @param outputType     information of output data
    +    * @param forwardIndices tuple of (input, output) indices of a forwarded field
    +    * @param customWrapper  used for figuring out proper type in specific cases,
    +    *                       e.g. {@see DataSetSingleRowJoin}
    +    * @return string with forwarded fields mapped from input to output
    +    */
    +  def getForwardedFields(
    +      inputType: TypeInfo[_],
    +      outputType: TypeInfo[_],
    +      forwardIndices: Seq[(Int, Int)],
    +      customWrapper: TypeInfo[_] =>
    +        Seq[(String, TypeInfo[_])] = throwMissedWrapperException): String = {
    +
    +    def chooseWrapper(
    +        typeInformation: TypeInfo[_]): Seq[(String, TypeInfo[_])] = {
    +
    +      typeInformation match {
    +        case composite: CompositeType[_] =>
    +          val fields = extractFields(composite)
    +          compositeTypeField(fields)
    +        case basic: BasicTypeInfo[_] =>
    +          Seq((s"*", basic))
    +        case array: BasicArrayTypeInfo[_, _] =>
    +          Seq((s"*", array))
    +        case _ =>
    +          customWrapper(typeInformation)
    +      }
    +    }
    +
    +    val wrapInput = chooseWrapper(inputType)
    +    val wrapOutput = chooseWrapper(outputType)
    +
    +    forwardFields(forwardIndices, wrapInput, wrapOutput)
    +  }
    +
    +  private def extractFields(
    +      composite: CompositeType[_]): Seq[(String, TypeInfo[_])] = {
    +
    +    val types = for {
    +      i <- 0 until composite.getArity
    +    } yield { composite.getTypeAt(i) }
    +
    +    composite.getFieldNames.zip(types)
    +  }
    +
    +  private def forwardFields(
    +      forwardIndices: Seq[(Int, Int)],
    +      wrappedInput: Int => (String, TypeInfo[_]),
    +      wrappedOutput: Int => (String, TypeInfo[_])): String = {
    +
    +    implicit class Field2ForwardField(left: (String, TypeInfo[_])) {
    +      def ->(right: (String, TypeInfo[_])): String = if (left.equals(right)) {
    +        s"${left._1}"
    +      } else {
    +        if (left._2.equals(right._2)) {
    +          s"${left._1}->${right._1}"
    +        } else {
    +          null
    +        }
    +      }
    +    }
    +
    +    forwardIndices map {
    +      case (in, out) =>
    +        wrappedInput(in) -> wrappedOutput(out)
    +    } filterNot(_ == null) mkString ";"
    +  }
    +
    +  def getDummyForwardedFields(
    +      leftDataSet: DataSet[Row],
    +      rightDataSet: DataSet[Row],
    +      returnType: TypeInfo[Row]): (String, String) = {
    +
    +    val leftFields = getDummyForwardedFields(leftDataSet, returnType)
    +    val rightFields = getDummyForwardedFields(rightDataSet, returnType)
    +    (leftFields, rightFields)
    +  }
    +
    +  def getDummyForwardedFields(
    +      dataSet: DataSet[Row],
    --- End diff --
    
    use `TypeInfo` as well


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