igalshilman opened a new pull request #7590: [FLINK-11329][core] Migrating CompositeSerializers URL: https://github.com/apache/flink/pull/7590 ## What is the purpose of the change This PR migrates the following serializers to the new `TypeSerializerSnapshot` abstraction: - ScalaOptionSerializer 4e1a755392 - StreamElementSerializer 9a0ddc1c28 - BufferEntrySerializer 9a56f43386 - UnionSerializer 317e6b863a - RowSerializer 3a1a86799e - NullableSerializer d93ff8a3a9 - CompositeSerializer ce253636d7 ## Brief change log Each commit migrates a single serializer's `TypeSerializerConfigSnapshot` to the new `TypeSerializerSnapsoht`. ## Verifying this change Each migrated serializer has an associated `StateMigrationTest` that verifies snapshot backwards compatibility with previous versions. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (**yes** / no / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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