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https://issues.apache.org/jira/browse/FLINK-12141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813139#comment-16813139
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Aljoscha Krettek commented on FLINK-12141:
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cc [~twalthr]
This sounds interesting.
> Allow @TypeInfo annotation on POJO field declarations
> -----------------------------------------------------
>
> Key: FLINK-12141
> URL: https://issues.apache.org/jira/browse/FLINK-12141
> Project: Flink
> Issue Type: New Feature
> Components: API / Type Serialization System
> Reporter: Gyula Fora
> Priority: Minor
> Labels: starter
>
> The TypeInfo annotation is a great way to declare serializers for custom
> types however I feel that it's usage is limited by the fact that it can only
> be used on types that are declared in the project.
> By allowing the annotation to be used on field declarations we could improve
> the TypeExtractor logic to use the type factory when creating the
> PojoTypeInformation.
> This would be a big improvement as in many cases classes from other libraries
> or collection types are used within custom Pojo classes and Flink would
> default to Kryo serialization which would hurt performance and cause problems
> later.
> The current workaround in these cases is to implement a custom serializer for
> the entire pojo which is a waste of effort when only a few fields might
> require custom serialization logic.
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