Au-Miner commented on code in PR #28681:
URL: https://github.com/apache/flink/pull/28681#discussion_r3557828248


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flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/plan/hints/batch/JoinHintTestBase.java:
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@@ -51,9 +51,6 @@
  * A test base for join hint.
  *
  * <p>TODO add test to cover legacy table source.
- *

Review Comment:
   Now both ast and optimize rel plan can correctly display different joinHints.
   Take testJoinHintsInNestedRexSubQUERY as an example,
   | XML File | Outer Subquery Hint | Inner Subquery Hint |
   |---|---|---|
   | `BroadcastJoinHintTest.xml` | `BROADCAST(T2)` | `SHUFFLE_HASH(T1)` |
   | `ShuffleHashJoinHintTest.xml` | `SHUFFLE_HASH(T2)` | `BROADCAST(T1)` |
   | `ShuffleMergeJoinHintTest.xml` | `SHUFFLE_MERGE(T2)` | `BROADCAST(T1)` |
   | `NestLoopJoinHintTest.xml` | `NEST_LOOP(T2)` | `BROADCAST(T1)` |
   | `QueryHintsResolverTest.xml` | `BROADCAST(T2)` | `SHUFFLE_HASH(T1)` |
   | `ClearQueryBlockAliasResolverTest.xml` | `BROADCAST(T2)` | 
`SHUFFLE_HASH(T1)` |
   
   Take testJoinHintWithDifferentHintsInSiblingSubQueries as an example,
   | XML File | First Sibling Hint | Second Sibling Hint |
   |---|---|---|
   | `BroadcastJoinHintTest.xml` | `BROADCAST(T2)` | `SHUFFLE_HASH(T1)` |
   | `ShuffleHashJoinHintTest.xml` | `SHUFFLE_HASH(T2)` | `BROADCAST(T1)` |
   | `ShuffleMergeJoinHintTest.xml` | `SHUFFLE_MERGE(T2)` | `BROADCAST(T1)` |
   | `NestLoopJoinHintTest.xml` | `NEST_LOOP(T2)` | `BROADCAST(T1)` |
   | `QueryHintsResolverTest.xml` | `BROADCAST(T2)` | `SHUFFLE_HASH(T1)` |
   | `ClearQueryBlockAliasResolverTest.xml` | `BROADCAST(T2)` | 
`SHUFFLE_HASH(T1)` |
   



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