dawidwys opened a new pull request #7872: [FLINK-11420][core] Fixed duplicate method of TraversableSerializer URL: https://github.com/apache/flink/pull/7872 ## What is the purpose of the change The duplicate method of TypeSerializer used an equality check rather than reference check of the element serializer to decide if we need a deep copy. This commit uses proper reference comparison. ## Brief change log *(for example:)* - enabled additional tests in SerializerTestInstance - fixed duplicate method of TraversableSerializer ## Verifying this change * enabled additional test (including `duplicate` method test in `SerializerTestInstance` ## 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 applicabl**e / docs / JavaDocs / not documented)
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