kl0u opened a new pull request #6871: [FLINK-10583][table] Add base TwoInputStreamOperator with TTL operator. URL: https://github.com/apache/flink/pull/6871 ## What is the purpose of the change This is the first step for the implementation of FLINK-10583 and FLINK-10584. It introduces the `AbstractTwoInputStreamOperatorWithTTL` which contains the basic functionality for implementing state TTL based on timers. This operator makes sure that: 1) only at most one timer is registered per key 2) both "sides" of the operator (processElement1 and processElement2) are treated equally when it comes to registering cleanup timers. ## Verifying this change Added the `AbstractTwoInputStreamOperatorWithTTLTest` with tests for the class. ## 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) R @pnowojski
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