lincoln-lil commented on code in PR #20577:
URL: https://github.com/apache/flink/pull/20577#discussion_r954433834
##########
docs/content/docs/dev/table/sql/queries/hints.md:
##########
@@ -84,4 +84,324 @@ insert into kafka_table1 /*+
OPTIONS('sink.partitioner'='round-robin') */ select
```
+## Query Hints
+
+### Join Hints
+
+#### LOOKUP Hint
+
+{{< label Streaming >}}
+
+The LOOKUP hint allows users to suggest the Flink optimizer to:
+1. use synchronous(sync) or asynchronous(async) lookup function
+2. configure the async parameters
+3. enable delayed retry strategy for lookup
+
+##### Syntax
Review Comment:
change to level4 "#### Syntax" ?
because LOOKUP hint is level4 and not displayed on index
##########
docs/content/docs/dev/table/sql/queries/hints.md:
##########
@@ -84,4 +84,324 @@ insert into kafka_table1 /*+
OPTIONS('sink.partitioner'='round-robin') */ select
```
+## Query Hints
+
+### Join Hints
+
+#### LOOKUP Hint
Review Comment:
the "### Join Hints" here is reserved for merge new join hint doc, to keep
consistent with other join hints, change "#### LOOKUP Hint" -> "#### LOOKUP"
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