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Posted to jira@kafka.apache.org by "Florin Akermann (Jira)" <ji...@apache.org> on 2023/07/24 07:25:00 UTC

[jira] [Commented] (KAFKA-14748) Relax non-null FK left-join requirement

    [ https://issues.apache.org/jira/browse/KAFKA-14748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17746242#comment-17746242 ] 

Florin Akermann commented on KAFKA-14748:
-----------------------------------------

Hi, I will have a go a this if ok.
If I haven't drafted any KIP or PR within three weeks then I am ok to be removed again.

> Relax non-null FK left-join requirement
> ---------------------------------------
>
>                 Key: KAFKA-14748
>                 URL: https://issues.apache.org/jira/browse/KAFKA-14748
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Matthias J. Sax
>            Priority: Major
>
> Kafka Streams enforces a strict non-null-key policy in the DSL across all key-dependent operations (like aggregations and joins).
> This also applies to FK-joins, in particular to the ForeignKeyExtractor. If it returns `null`, it's treated as invalid. For left-joins, it might make sense to still accept a `null`, and add the left-hand record with an empty right-hand-side to the result.



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