[GitHub] [flink] swuferhong commented on pull request #20513: [FLINK-28858][docs] Add document to describe join hints for batch sql

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swuferhong commented on PR #20513:
URL: https://github.com/apache/flink/pull/20513#issuecomment-1217382778

   > @swuferhong for the structure of the document, my suggestion is like 
follows:
   > 
   > ## Query Hints
   > some description...
   > 
   > ### Syntax
   > ```sql
   > query hints:
   > 
   > SELECT /*+ hint [, hint ]* */
   > 
   > hint:
   >       hintName
   >   |   hintName '(' optionKey '=' optionVal [, optionKey '=' optionVal ]* 
')'
   >   |   hintName '(' hintOption [, hintOption ]* ')'
   > 
   > optionKey:
   >       simpleIdentifier
   >   |   stringLiteral
   > 
   > optionVal:
   >       stringLiteral
   > 
   > hintOption:
   >       simpleIdentifier
   >    |  numericLiteral
   >    |  stringLiteral
   > ```
   > 
   > ### Join Hints
   > some description...
   > 
   > #### Join Hints - BROADCAST
   > {{< label Batch >}}
   > 
   > #### Join Hints - SHUFFLE_HASH
   > {{< label Batch >}}
   > 
   > #### Join Hints - SHUFFLE_MERGE
   > {{< label Batch >}}
   > 
   > #### Join Hints - NEST_LOOP
   > {{< label Batch >}}
   > 
   > // the LOOKUP for streaming will be added in #20577
   > 
   > #### Join Hints - LOOKUP
   > {{< label Streaming >}}
   
   Thanks very much, I have adjusted the structure to the above structure.


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