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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1032) Extend POJO Field Selectors to Support Accessing Nested Objects
Date Sun, 05 Oct 2014 15:41:33 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14159562#comment-14159562
] 

ASF GitHub Bot commented on FLINK-1032:
---------------------------------------

Github user StephanEwen commented on the pull request:

    https://github.com/apache/incubator-flink/pull/141#issuecomment-57940003
  
    The error message *"Type GenericType<test.PoJoTestProgram.MyType> is not a composite
type. Key expressions are not supported."* is not very helpful, IMHO.
    
    How about writing something like `Key expressions are only supported on POJO types. A
type is considered a POJO if all its fields are public, or have bother getters and setters
defined`. That would immediately tell the user where to look for the error, or how to alter
his types.


> Extend POJO Field Selectors to Support Accessing Nested Objects
> ---------------------------------------------------------------
>
>                 Key: FLINK-1032
>                 URL: https://issues.apache.org/jira/browse/FLINK-1032
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Java API
>            Reporter: Aljoscha Krettek
>            Assignee: Robert Metzger
>
> Right now you can only use fields of the top-level object as key fields in groupings,
joins, and co-group. This should be extended to allow using nested fields. We have to be careful
with null fields, though.



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