swuferhong commented on code in PR #20513:
URL: https://github.com/apache/flink/pull/20513#discussion_r948853362
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docs/content/docs/dev/table/sql/queries/hints.md:
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@@ -84,4 +84,205 @@ insert into kafka_table1 /*+
OPTIONS('sink.partitioner'='round-robin') */ select
```
+## Query Hints
+
+`Query Hints` specify that the indicated hints are used in the scope of a
query. They affect all operators in the statement.
+Now, Flink `Query Hints` support `Join Hints`.
+
+### Syntax
+The `Query Hints` syntax in Flink:
+```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
+
+Join hints allow users to suggest the join strategy to optimizer in order to
get a more optimal execution plan.
+Now Flink `Join Hints` support `BROADCAST`, `SHUFFLE_HASH`, `SHUFFLE_MERGE`
and `NEST_LOOP` Join Hints. Also, for same cases,
Review Comment:
> 'for some cases' ?
Done!
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