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https://issues.apache.org/jira/browse/FLINK-20825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17335547#comment-17335547
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Jark Wu commented on FLINK-20825:
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cc [~lirui]
> Upsert-kafka should throw a better exception when the key of the record is
> NULL
> -------------------------------------------------------------------------------
>
> Key: FLINK-20825
> URL: https://issues.apache.org/jira/browse/FLINK-20825
> Project: Flink
> Issue Type: Improvement
> Components: Connectors / Kafka, Table SQL / Ecosystem
> Affects Versions: 1.12.0
> Reporter: Shengkai Fang
> Priority: Major
> Labels: stale-major
>
> Currently, it will get NPE when reading from the upsert-kafka with record
> whose key is NULL.
> The records in the compacted topic always have keys. Therefore, it's mainly
> wrong usage of the upsert-kafka that causing NPE. We can throw a better
> exception to notify the users.
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