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https://issues.apache.org/jira/browse/FLINK-23727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17401428#comment-17401428
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Paul Lin commented on FLINK-23727:
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[~paul8263] Thanks for your contribution, but the PR involves serialization
which is beyond the scope of this issue. I'm not sure if it's valid to pass
nulls to a serializer, because stream elements should not be null. Plus, I've
prepared PR for this issue, just waiting for the issue to be assigned as the
contribution guide requires.
> Skip null values in SimpleStringSchema#deserialize
> --------------------------------------------------
>
> Key: FLINK-23727
> URL: https://issues.apache.org/jira/browse/FLINK-23727
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Affects Versions: 1.13.2
> Reporter: Paul Lin
> Priority: Major
> Labels: pull-request-available
>
> In Kafka use cases, it's valid to send a message with a key and a null
> payload as a tombstone. But SimpleStringSchema, which is frequently used as a
> message value deserializer, throws NPE when the input value is null. We
> should tolerate null values in SimpleStringSchema (simply return null to skip
> the records), otherwise users need to implement a custom one.
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