[jira] [Commented] (FLINK-1245) Introduce TypeHints for Java API operators

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

    [ https://issues.apache.org/jira/browse/FLINK-1245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212855#comment-14212855 ] 

ASF GitHub Bot commented on FLINK-1245:
---------------------------------------

GitHub user twalthr opened a pull request:

    https://github.com/apache/incubator-flink/pull/203

    [FLINK-1245] Introduce TypeHints for Java API operators

    This PR contains:
    
    - .returns(String), .returns(TypeInformation), .returns(Class) for all Java API UdfOperators
    - a new UnknownTypeInfo with a corresponding new UnknownTypeSerializer which uses Kryo in a special configuration
    - the TypeExtractor does not throw Exceptions anymore if it recognizes type erasure, 
      instead it prints log warnings and returns a UnknownTypeInfo
    - Java 8 Lambdas can now be compiled and run with Oracle JDK for development (not efficient due to UnknownTypeInfo)
    - since TypeInfoParser is now "Public API" I reworked it such it also support Pojos
    - Unit Tests test TypeHints, Serializers, TypeExtractor and Lambdas

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

    $ git pull https://github.com/twalthr/incubator-flink TypeInfoRework

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

    https://github.com/apache/incubator-flink/pull/203.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 #203
    
----
commit 8574f9c6c8f518ef54d363d07e6d53462de78d5d
Author: twalthr <in...@twalthr.com>
Date:   2014-11-07T15:18:23Z

    [FLINK-1245] Introduce TypeHints for Java API operators

----


> Introduce TypeHints for Java API operators
> ------------------------------------------
>
>                 Key: FLINK-1245
>                 URL: https://issues.apache.org/jira/browse/FLINK-1245
>             Project: Flink
>          Issue Type: Improvement
>          Components: Java API
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>
> Due to type extraction issues with Java 8 Lambdas and many users with type erasure issues, TypeHints need to be introduced.
> The whole discussion can be found on the mailing list:
> http://mail-archives.apache.org/mod_mbox/flink-dev/201410.mbox/%3C544FA7D6.1070708@twalthr.com%3E



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