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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10116) createComparator fails on case class with Unit type fields prior to the join-key
Date Fri, 10 Aug 2018 10:35:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16576080#comment-16576080
] 

Fabian Hueske commented on FLINK-10116:
---------------------------------------

Hi Will,

Thanks for reporting the problem. I could reproduce it with a simpler program

{code:scala}
case class MyCC(a: Unit, b: Unit, c: String)

val cc = MyCC("A", "B", "C")
val set = env.fromElements(cc)
set.groupBy("c").first(1).print()
{code}

Your analysis is correct. This is a problem with the key extraction from case class types
and seems to be located in {{CaseClassTypeInfo.getFlatFields()}}.

> createComparator fails on case class with Unit type fields prior to the join-key
> --------------------------------------------------------------------------------
>
>                 Key: FLINK-10116
>                 URL: https://issues.apache.org/jira/browse/FLINK-10116
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API
>    Affects Versions: 1.3.3, 1.6.0
>            Reporter: Will
>            Priority: Major
>         Attachments: JobFail.scala, JobPass.scala
>
>
> h1. Overview
> When joining between case classes, if the attribute representing the join-key comes
after Unit definition of fields (that are not being used) the join will fail with the error
> {quote}{{Exception in thread "main" java.lang.IllegalArgumentException: Could not add
a comparator for the logicalkey field index 0.}}
>  \{{ at org.apache.flink.api.common.typeutils.CompositeType.createComparator(CompositeType.java:162)}}
>  \{{ at org.apache.flink.optimizer.postpass.JavaApiPostPass.createComparator(JavaApiPostPass.java:293)}}
>  \{{ at org.apache.flink.optimizer.postpass.JavaApiPostPass.traverse(JavaApiPostPass.java:193)}}
> {quote}
> Using TypeInformation keys does not exhibit the same issue. Initial debugging suggests
that when calculating the index of the key for strings, Flink doesn't count Unit elements,
however they are included during iteration in CompositeType.createComparator which leads to
the search failing on the key appearing to be a Unit type.
> h1. Code Examples to Reproduce
> [^JobFail.scala]
> [^JobPass.scala]
>  
> h1. ^Inline Code^
> h2. ^Fail^
> {code:java}
> package org.demo
> /**
>   * 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.
>   */
> import org.apache.flink.api.common.functions.RichJoinFunction
> import org.apache.flink.api.java.DataSet
> import org.apache.flink.api.scala._
> object JobFail {
>   case class LeftJoin (
>                         FieldA: String = "",
>                         FieldB: String = "",
>                         FieldC: String = "",
>                         JoinIndex: String = ""
>                       )
>   case class RightJoin (
>                          FieldD: Unit = Unit,
>                          FieldE: Unit = Unit,
>                          FieldF: Unit = Unit,
>                          JoinIndex: String = ""
>                        )
>   case class Merged (
>                       var FieldA: String = "",
>                       var FieldB: String = "",
>                       var FieldC: String = "",
>                       var FieldD: String = "",
>                       var FieldE: String = "",
>                       var FieldF: String = "",
>                       var JoinIndex: String = ""
>                     )
>   class JoinHelper() extends RichJoinFunction[LeftJoin, RightJoin, Merged]{
>     override def join(first: LeftJoin, second: RightJoin): Merged = {
>       val out = new Merged()
>       out.FieldA = first.FieldA
>       out.FieldB = first.FieldB
>       out.FieldC = first.FieldC
>       if (second != null){
>         /*out.FieldD = second.FieldD
>         out.FieldE = second.FieldE
>         out.FieldF = second.FieldF*/
>       }
>       out
>     }
>   }
>   def main(args: Array[String]) {
>     // set up the execution environment
>     val env = ExecutionEnvironment.getExecutionEnvironment
>     val leftOne = new LeftJoin("FieldA1", "FieldB1", "FieldC1", "index")
>     val rightOne = new RightJoin("FieldD1", "FieldE1", "FieldF1", "index")
>     val left = env.fromElements(leftOne)
>     val right = env.fromElements(rightOne)
>     // TODO: String key fails
>     val joined = left.leftOuterJoin(right).where("JoinIndex").equalTo("JoinIndex").apply(new
JoinHelper())
>     joined.print()
>   }
> }
> {code}
> h2. ^Pass^
> {code:java}
> package org.demo
> /**
>   * 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.
>   */
> import org.apache.flink.api.common.functions.RichJoinFunction
> import org.apache.flink.api.java.DataSet
> import org.apache.flink.api.scala._
> object JobPass {
>   case class LeftJoin (
>                         FieldA: String = "",
>                         FieldB: String = "",
>                         FieldC: String = "",
>                         JoinIndex: String = ""
>                       )
>   case class RightJoin (
>                          FieldD: Unit = Unit,
>                          FieldE: Unit = Unit,
>                          FieldF: Unit = Unit,
>                          JoinIndex: String = ""
>                        )
>   case class Merged (
>                       var FieldA: String = "",
>                       var FieldB: String = "",
>                       var FieldC: String = "",
>                       var FieldD: String = "",
>                       var FieldE: String = "",
>                       var FieldF: String = "",
>                       var JoinIndex: String = ""
>                     )
>   class JoinHelper() extends RichJoinFunction[LeftJoin, RightJoin, Merged]{
>     override def join(first: LeftJoin, second: RightJoin): Merged = {
>       val out = new Merged()
>       out.FieldA = first.FieldA
>       out.FieldB = first.FieldB
>       out.FieldC = first.FieldC
>       if (second != null){
>         /*out.FieldD = second.FieldD
>         out.FieldE = second.FieldE
>         out.FieldF = second.FieldF*/
>       }
>       out
>     }
>   }
>   def main(args: Array[String]) {
>     // set up the execution environment
>     val env = ExecutionEnvironment.getExecutionEnvironment
>     val leftOne = new LeftJoin("FieldA1", "FieldB1", "FieldC1", "index")
>     val rightOne = new RightJoin("FieldD1", "FieldE1", "FieldF1", "index")
>     val left = env.fromElements(leftOne)
>     val right = env.fromElements(rightOne)
>     // TODO: TypeInformation key passes
>     val joined = left.leftOuterJoin(right).where(_.JoinIndex).equalTo(_.JoinIndex).apply(new
JoinHelper())
>     joined.print()
>   }
> }
> {code}
>  
>  



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