[jira] [Commented] (FLINK-629) Add support for null values to the java api

["Ufuk Celebi (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14053726#comment-14053726 ] 

Ufuk Celebi commented on FLINK-629:
-----------------------------------

I think we should push this before the next release as a couple of users have already walked into this problem.

> Add support for null values to the java api
> -------------------------------------------
>
>                 Key: FLINK-629
>                 URL: https://issues.apache.org/jira/browse/FLINK-629
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Stephan Ewen
>              Labels: github-import
>             Fix For: pre-apache
>
>
> Currently, many runtime operations fail when encountering a null value. Tuple serialization should allow null fields.
> I suggest to add a method to the tuples called `getFieldNotNull()` which throws a meaningful exception when the accessed field is null. That way, we simplify the logic of operators that should not dead with null fields, like key grouping or aggregations.
> Even though SQL allows grouping and aggregating of null values, I suggest to exclude this from the java api, because the SQL semantics of aggregating null fields are messy.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/629
> Created by: [StephanEwen|https://github.com/StephanEwen]
> Labels: enhancement, java api, 
> Milestone: Release 0.5.1
> Created at: Wed Mar 26 00:27:49 CET 2014
> State: open



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