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https://issues.apache.org/jira/browse/FLINK-2203?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14581599#comment-14581599
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Timo Walther commented on FLINK-2203:
-------------------------------------

I will implement this issue. How should null values be represented? A byte 
before each row column or with a row header indicating which rows are null?

> Add Support for Null-Values in RowSerializer
> --------------------------------------------
>
>                 Key: FLINK-2203
>                 URL: https://issues.apache.org/jira/browse/FLINK-2203
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API
>            Reporter: Aljoscha Krettek
>            Assignee: Timo Walther
>            Priority: Minor
>              Labels: Starter
>
> This would be a start towards proper handling of null values. We would still 
> need to add support for null values in aggregations.



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