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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/07/21 11:43:20 UTC

[GitHub] [flink] dawidwys opened a new pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

dawidwys opened a new pull request #12945:
URL: https://github.com/apache/flink/pull/12945


   ## What is the purpose of the change
   
   Adding a generic type to the method makes it possible to pass the type
   from a lambda function. Otherwise a wildcard type '?' is derived as
   Object and thus TypeExtractor extract a GenericTypeInfo<Object> for the
   key.
   
   ## Brief change log
   
   * Changed method ConnctedStream#keyBy to accept `KeySelector` of the same generic type in both scala and java API
   * Replaced an internal KeySelectorWithType class in scala API with explicitly passing the keyType to the underlying java API.
   
   ## Verifying this change
   
   Added test:
   * `DataStreamTest#testKeyedConnectedStreamsType`
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (**yes** / no)
     - The serializers: (**yes** / no / don't know) -> can change serializer for keys in StateBackends
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
   


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[GitHub] [flink] dawidwys merged pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
dawidwys merged pull request #12945:
URL: https://github.com/apache/flink/pull/12945


   


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[GitHub] [flink] aljoscha commented on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
aljoscha commented on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-663402839


   Even with the required japicmp exclusion I think this is still a good change. 👌


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot commented on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661806791


   Thanks a lot for your contribution to the Apache Flink project. I'm the @flinkbot. I help the community
   to review your pull request. We will use this comment to track the progress of the review.
   
   
   ## Automated Checks
   Last check on commit 849a7a97e2536f429f8869beb4b76be6f3354570 (Tue Jul 21 11:45:49 UTC 2020)
   
   **Warnings:**
    * No documentation files were touched! Remember to keep the Flink docs up to date!
   
   
   <sub>Mention the bot in a comment to re-run the automated checks.</sub>
   ## Review Progress
   
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   * ❓ 5. Overall code [quality] is good.
   
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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot commented on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot commented on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] dawidwys commented on a change in pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
dawidwys commented on a change in pull request #12945:
URL: https://github.com/apache/flink/pull/12945#discussion_r459604168



##########
File path: flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/ConnectedStreams.scala
##########
@@ -300,19 +300,22 @@ class ConnectedStreams[IN1, IN2](javaStream: JavaCStream[IN1, IN2]) {
    * @param fun2 The second stream's key function
    * @return The key-grouped connected streams
    */
-  def keyBy[K1: TypeInformation, K2: TypeInformation](fun1: IN1 => K1, fun2: IN2 => K2):
+  def keyBy[KEY: TypeInformation](fun1: IN1 => KEY, fun2: IN2 => KEY):
       ConnectedStreams[IN1, IN2] = {
 
-    val keyType1 = implicitly[TypeInformation[K1]]
-    val keyType2 = implicitly[TypeInformation[K2]]
-    
+    val keyType = implicitly[TypeInformation[KEY]]
+
     val cleanFun1 = clean(fun1)
     val cleanFun2 = clean(fun2)
-    
-    val keyExtractor1 = new KeySelectorWithType[IN1, K1](cleanFun1, keyType1)
-    val keyExtractor2 = new KeySelectorWithType[IN2, K2](cleanFun2, keyType2)
-    
-    asScalaStream(javaStream.keyBy(keyExtractor1, keyExtractor2))
+
+    val keyExtractor1 = new KeySelector[IN1, KEY] {

Review comment:
       I reverted the internal class. 
   
   My main goal here was to pass the key type explicitly rather than through the `ResultTypeQueryable`, which requires running `TypeExtractor`. 




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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] aljoscha commented on a change in pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
aljoscha commented on a change in pull request #12945:
URL: https://github.com/apache/flink/pull/12945#discussion_r459443786



##########
File path: flink-streaming-scala/src/main/scala/org/apache/flink/streaming/api/scala/ConnectedStreams.scala
##########
@@ -300,19 +300,22 @@ class ConnectedStreams[IN1, IN2](javaStream: JavaCStream[IN1, IN2]) {
    * @param fun2 The second stream's key function
    * @return The key-grouped connected streams
    */
-  def keyBy[K1: TypeInformation, K2: TypeInformation](fun1: IN1 => K1, fun2: IN2 => K2):
+  def keyBy[KEY: TypeInformation](fun1: IN1 => KEY, fun2: IN2 => KEY):
       ConnectedStreams[IN1, IN2] = {
 
-    val keyType1 = implicitly[TypeInformation[K1]]
-    val keyType2 = implicitly[TypeInformation[K2]]
-    
+    val keyType = implicitly[TypeInformation[KEY]]
+
     val cleanFun1 = clean(fun1)
     val cleanFun2 = clean(fun2)
-    
-    val keyExtractor1 = new KeySelectorWithType[IN1, K1](cleanFun1, keyType1)
-    val keyExtractor2 = new KeySelectorWithType[IN2, K2](cleanFun2, keyType2)
-    
-    asScalaStream(javaStream.keyBy(keyExtractor1, keyExtractor2))
+
+    val keyExtractor1 = new KeySelector[IN1, KEY] {

Review comment:
       nit: I like the simplicity of the code but I think stacktraces are harder to parse with anonymous classes thrown in the mix. Just a thought, though.




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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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[GitHub] [flink] flinkbot edited a comment on pull request #12945: [FLINK-18629] Add type to ConnectedStreams#keyBy

Posted by GitBox <gi...@apache.org>.
flinkbot edited a comment on pull request #12945:
URL: https://github.com/apache/flink/pull/12945#issuecomment-661810553


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