[GitHub] [flink] beyond1920 opened a new pull request #9285: [FLINK-13433][table-planner-blink] Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value.

[GitBox <gi...@apache.org>]

beyond1920 opened a new pull request #9285: [FLINK-13433][table-planner-blink]  Do not fetch data from LookupableTableSource if the JoinKey in left side of LookupJoin contains null value.
URL: https://github.com/apache/flink/pull/9285
 
 
   ## What is the purpose of the change
   
   For LookupJoin, if joinKey in left side of a LeftOuterJoin/InnerJoin contains null values, there is no need to fetch data from `LookupableTableSource`. 
   However, we don't shortcut the fetch function under the case at present, the correctness of results depends on the `TableFunction` implementation of each `LookupableTableSource`.
   
   ## Brief change log
   
     - correct the behavior of `LookupJoin` where lookupKeys contains null.
     - Add more testcases.
   
   ## Verifying this change
   testcases
   
   ## 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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