wuchong opened a new pull request #8629: [FLINK-12088][table-runtime-blink] 
Introduce unbounded streaming inner/left/right/full join operator
URL: https://github.com/apache/flink/pull/8629
 
 
   
   ## What is the purpose of the change
   
   Introduce unbounded streaming inner/left/right/full join operator. We will 
support SEMI/ANTI in another pull request.
   
   ## Brief change log
   
     - Introduce `JoinInputSideSpec` describes input information, for example: 
has/not unique key.
     - Introduce `JoinRecordStateView` to encapsulates the join state and 
provides some APIs facing the input records. Because we will have different 
state structure depends on the input information.
     - Introduce `StreamingJoinOperator` to support INNER/LEFT/RIGHT/FULL 
together.
   
   ## Verifying this change
   
   Adds `JoinITCase` to test join end-to-end.
   
   ## 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? (no)
     - If yes, how is the feature documented? (not applicable)
   

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