dawidwys opened a new pull request #10340: [FLINK-14978][table-api] Introduce constraint class hierarchy required for primary keys URL: https://github.com/apache/flink/pull/10340 ## What is the purpose of the change This PR adds the class hierarchy required for supporting PRIMARY KEY constraint. It exposes that information through `TableSchema`. ## Verifying this change Added tests in: * org.apache.flink.table.api.constraints.KeyConstraintTest * org.apache.flink.table.api.TableSchemaTest ## 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**) - we do not want to make it too visible for the users yet. In the first version we primarily want to use it to support Hive's primary keys.
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