Hi, all.
    I want to start a discussion about the FLIP-229: Introduces Join Hint for 
Flink SQL Batch Job(The cwiki[1] is not ready completely but you can see the 
whole details in docs[2]).
Join Hint is a common solution in many popular computing engines and DBs to 
improve the shortcomings of the optimizer by intervening in optimizing the 
plan. By Join Hint, users can intervene in the selection of the join strategy 
in optimizer, and manually optimize the execution plan to improve the 
performance of the query.
    In this FLIP, we propose some join hints by the existing join strategies in 
Flink SQL for Batch job.
I'm look forward to your feedback about FLIP-229.




--

    Best!
    Xuyang


[1] 
https://cwiki.apache.org/confluence/display/FLINK/FLIP-229%3A+Introduces+Join+Hint+for+Flink+SQL+Batch+Job
[2] 
https://docs.google.com/document/d/1IL00ME0Z0nlXGDWTUPODobVQMAm94PAPr9pw9EdGkoQ/edit?usp=sharing

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