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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4374) GroupReduce Broken for null Date
Date Thu, 11 Aug 2016 12:51:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417157#comment-15417157
] 

Stephan Ewen commented on FLINK-4374:
-------------------------------------

Null is not really generically supported in Flink. Is this as part of a POJO or so?

> GroupReduce Broken for null Date
> --------------------------------
>
>                 Key: FLINK-4374
>                 URL: https://issues.apache.org/jira/browse/FLINK-4374
>             Project: Flink
>          Issue Type: Bug
>          Components: DataSet API
>            Reporter: Stefan Richter
>            Assignee: Timo Walther
>
> The GroupReduceITCase has an error that allows a problem with {{null}} Dates to go uncovered:
>  If I set the parallelism to 1 in {{testDateNullException()}} and all keys actually end
up on the same operator, then there is a problem in the de/serialization.
> It seems that {{null}} values are somehow skipped by the serialization process (e.g.
maybe no {{null}} indicator is written), which leads to wrong deserializations.



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