[jira] [Commented] (FLINK-3138) Method References are not supported as lambda expressions

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405865#comment-15405865 ] 

ASF GitHub Bot commented on FLINK-3138:
---------------------------------------

GitHub user twalthr opened a pull request:

    https://github.com/apache/flink/pull/2329

    [FLINK-3138] [types] Method References are not supported as lambda expressions

    Thanks for contributing to Apache Flink. Before you open your pull request, please take the following check list into consideration.
    If your changes take all of the items into account, feel free to open your pull request. For more information and/or questions please refer to the [How To Contribute guide](http://flink.apache.org/how-to-contribute.html).
    In addition to going through the list, please provide a meaningful description of your changes.
    
    - [x] General
      - The pull request references the related JIRA issue ("[FLINK-XXX] Jira title text")
      - The pull request addresses only one issue
      - Each commit in the PR has a meaningful commit message (including the JIRA id)
    
    - [x] Documentation
      - Documentation has been added for new functionality
      - Old documentation affected by the pull request has been updated
      - JavaDoc for public methods has been added
    
    - [x] Tests & Build
      - Functionality added by the pull request is covered by tests
      - `mvn clean verify` has been executed successfully locally or a Travis build has passed
    
    This PR fixes a small bug in the TypeExtractor and adds more tests to verify Java 8 method references.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/twalthr/flink FLINK-3138

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/flink/pull/2329.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2329
    
----
commit c7ed2239022b8ea1b1322054d6a9d4c329034a83
Author: twalthr <tw...@apache.org>
Date:   2016-08-03T12:18:40Z

    [FLINK-3138] [types] Method References are not supported as lambda expressions

----


> Method References are not supported as lambda expressions
> ---------------------------------------------------------
>
>                 Key: FLINK-3138
>                 URL: https://issues.apache.org/jira/browse/FLINK-3138
>             Project: Flink
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.10.2
>            Reporter: Stephan Ewen
>            Assignee: Timo Walther
>             Fix For: 1.0.0
>
>
> For many functions (here for example KeySelectors), one can use lambda expressions:
> {code}
> DataStream<MyType> stream = ...;
> stream.keyBy( v -> v.getId() )
> {code}
> Java's other syntax for this, Method References, do not work:
> {code}
> DataStream<MyType> stream = ...;
> stream.keyBy( MyType::getId )
> {code}



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