[GitHub] [flink] wuchong opened a new pull request #10213: [FLINK-12846][table-common] Carry primary key and unique key information in TableSchema

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wuchong opened a new pull request #10213: [FLINK-12846][table-common] Carry primary key and unique key information in TableSchema
URL: https://github.com/apache/flink/pull/10213
 
 
   ## What is the purpose of the change
   
   The primary key and unique key is a standard meta information in SQL. And they are important information for optimization, for example, AggregateRemove, AggregateReduceGrouping and state layout optimization for TopN and Join.
   
   So in this PR, we extend TableSchema to carry more information about primary key and unique keys. 
   
   Bridge the primary key of TableSchema to DDL and planner metadata will be done in other PRs. 
   
   ## Brief change log
   
   1. Add primary key and unique key to `TableSchema` with some Javadocs. 
   
   
   ## Verifying this change
   
   1. Adds some tests in `TableSchemaTest` to check the unique key and primary key.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (no)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no)
     - The serializers: (no)
     - The runtime per-record code paths (performance sensitive): (no)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes)
     - If yes, how is the feature documented? (not documented)
   

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