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cyberdelia avatar cyberdelia commented on June 16, 2024

It's a limitation of Flink when using tuples, see: https://nightlies.apache.org/flink/flink-docs-release-1.17/docs/dev/datastream/fault-tolerance/serialization/types_serialization/#flinks-typeinformation-class

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drenizg avatar drenizg commented on June 16, 2024

Hi, I came across this same issue... I understand this is a Flink limitation when using tuples, but:

  • How can we deal with nullable fields in Kotlin data classes? I think most non-trivial use cases would require some way to do so
  • Could TypeInfo for data classes be somehow modeled as a subclass of PojoTypeInfo instead of TupleTypeInfoBase? Flink documentation doesn't state POJOs have this same not-null limitation as Tuples do

PS: sorry to bring this up again, but seemed better to open a new issue

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cyberdelia avatar cyberdelia commented on June 16, 2024

You can model nullable values as a distinct type that isn't nilable.

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drenizg avatar drenizg commented on June 16, 2024

Right, I thought that too. I tried using Java's Optional, but this can only be serialized via Flink Kryo fallback, which is not desirable. Do you see a better approach?

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