diff --git a/planner/core/physical_plan_test.go b/planner/core/physical_plan_test.go
index f0d5a44e437d7..6de6f5b51bbf5 100644
--- a/planner/core/physical_plan_test.go
+++ b/planner/core/physical_plan_test.go
@@ -661,3 +661,51 @@ func (s *testPlanSuite) TestIndexJoinHint(c *C) {
 		}
 	}
 }
+
+func (s *testPlanSuite) TestHintFromDiffDatabase(c *C) {
+	defer testleak.AfterTest(c)()
+	store, dom, err := newStoreWithBootstrap()
+	c.Assert(err, IsNil)
+	defer func() {
+		dom.Close()
+		store.Close()
+	}()
+	se, err := session.CreateSession4Test(store)
+	c.Assert(err, IsNil)
+	ctx := context.Background()
+	_, err = se.Execute(ctx, "use test")
+	c.Assert(err, IsNil)
+	_, err = se.Execute(ctx, `drop table if exists test.t1`)
+	c.Assert(err, IsNil)
+	_, err = se.Execute(ctx, `create table test.t1(a bigint, index idx_a(a));`)
+	c.Assert(err, IsNil)
+	_, err = se.Execute(ctx, `create table test.t2(a bigint, index idx_a(a));`)
+	c.Assert(err, IsNil)
+
+	_, err = se.Execute(ctx, "drop database if exists test2")
+	c.Assert(err, IsNil)
+	_, err = se.Execute(ctx, "create database test2")
+	c.Assert(err, IsNil)
+	_, err = se.Execute(ctx, "use test2")
+	c.Assert(err, IsNil)
+
+	var input []string
+	var output []struct {
+		SQL  string
+		Plan string
+	}
+	is := domain.GetDomain(se).InfoSchema()
+	s.testData.GetTestCases(c, &input, &output)
+	for i, tt := range input {
+		comment := Commentf("case:%v sql: %s", i, tt)
+		stmt, err := s.ParseOneStmt(tt, "", "")
+		c.Assert(err, IsNil, comment)
+		p, _, err := planner.Optimize(ctx, se, stmt, is)
+		c.Assert(err, IsNil, comment)
+		s.testData.OnRecord(func() {
+			output[i].SQL = tt
+			output[i].Plan = core.ToString(p)
+		})
+		c.Assert(core.ToString(p), Equals, output[i].Plan, comment)
+	}
+}
diff --git a/planner/core/planbuilder.go b/planner/core/planbuilder.go
index b49ae3b3eed87..32274f561bbdd 100644
--- a/planner/core/planbuilder.go
+++ b/planner/core/planbuilder.go
@@ -67,9 +67,20 @@ func tableNames2HintTableInfo(tableNames []model.CIStr) []hintTableInfo {
 	if len(tableNames) == 0 {
 		return nil
 	}
+<<<<<<< HEAD
 	hintTables := make([]hintTableInfo, 0, len(tableNames))
 	for _, tableName := range tableNames {
 		hintTables = append(hintTables, hintTableInfo{name: tableName})
+=======
+	hintTableInfos := make([]hintTableInfo, len(hintTables))
+	defaultDBName := model.NewCIStr(ctx.GetSessionVars().CurrentDB)
+	for i, hintTable := range hintTables {
+		tableInfo := hintTableInfo{dbName: hintTable.DBName, tblName: hintTable.TableName, selectOffset: p.getHintOffset(hintTable.QBName, nodeType, currentOffset)}
+		if tableInfo.dbName.L == "" {
+			tableInfo.dbName = defaultDBName
+		}
+		hintTableInfos[i] = tableInfo
+>>>>>>> 5268094... planner: correct the dbName for hint (#15319)
 	}
 	return hintTables
 }
diff --git a/planner/core/testdata/plan_suite_in.json b/planner/core/testdata/plan_suite_in.json
index a6aaf2907db64..d4a7c54332150 100644
--- a/planner/core/testdata/plan_suite_in.json
+++ b/planner/core/testdata/plan_suite_in.json
@@ -429,5 +429,73 @@
     "cases": [
       "select t1.a, (select count(t2.a) from t t2 where t2.g in (select t3.d from t t3 where t3.c = t1.a)) as agg_col from t t1;"
     ]
+<<<<<<< HEAD
+=======
+  },
+  {
+    "name": "TestIndexJoinHint",
+    "cases": [
+      "select /*+ INL_JOIN(t1) */ * from t1 join t2 on t1.a = t2.a;",
+      "select /*+ INL_HASH_JOIN(t1) */ * from t1 join t2 on t1.a = t2.a;",
+      "select /*+ INL_MERGE_JOIN(t1) */ * from t1 join t2 on t1.a = t2.a;"
+    ]
+  },
+  {
+    "name": "TestAggToCopHint",
+    "cases": [
+      "select /*+ AGG_TO_COP(), HASH_AGG(), USE_INDEX(t) */ sum(a) from ta group by a",
+      "select /*+ AGG_TO_COP(), USE_INDEX(t) */ sum(b) from ta group by b",
+      "select /*+ AGG_TO_COP(), HASH_AGG(), USE_INDEX(t) */ distinct a from ta group by a",
+      "select /*+ AGG_TO_COP(), HASH_AGG(), HASH_JOIN(t1), USE_INDEX(t1), USE_INDEX(t2) */ sum(t1.a) from ta t1, ta t2 where t1.a = t2.b group by t1.a"
+    ]
+  },
+  {
+    "name": "TestDAGPlanBuilderWindow",
+    "cases":[
+      "select lead(a, 1) over (partition by null) as c from t"
+    ]
+  },
+  {
+    "name": "TestDAGPlanBuilderWindowParallel",
+    "cases":[
+      "select lead(a, 1) over (partition by null) as c from t",
+      "select lead(a, 1) over (partition by b) as c from t"
+    ]
+  },
+  {
+    "name": "TestNominalSort",
+    "cases": [
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by t1.a",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by t1.a+1",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by t1.a-1",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by -t1.a",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by -t1.a+3",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by 1+t1.a",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by 1-t1.a",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by 1-t1.a+3",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by 1+t1.a+3",
+      "select /*+ TIDB_SMJ(t1, t2) */ t1.a from t t1, t t2 where t1.a = t2.b order by 3*t1.a"
+    ]
+  },
+  {
+    "name": "TestInlineProjection",
+    "cases":[
+      "select /*+ HASH_JOIN(t1) */ t1.b, t2.b from t1, t2 where t1.a = t2.a;",
+      "select /*+ HASH_JOIN(t1) */ t1.b, t2.b from t1 inner join t2 on t1.a = t2.a;",
+      "select /*+ HASH_JOIN(t1) */ t1.b, t2.b from t1 left outer join t2 on t1.a = t2.a;",
+      "select /*+ HASH_JOIN(t1) */ t1.b, t2.b from t1 right outer join t2 on t1.a = t2.a;",
+      "select 1 from (select /*+ HASH_JOIN(t1) */ t1.a in (select t2.a from t2) from t1) x;",
+      "select 1 from (select /*+ HASH_JOIN(t1) */ t1.a not in (select t2.a from t2) from t1) x;",
+      "select /*+ INL_JOIN(t1) */ t1.b, t2.b from t1 inner join t2 on t1.a = t2.a;",
+      "select /*+ INL_HASH_JOIN(t1) */ t1.b, t2.b from t1 inner join t2 on t1.a = t2.a;",
+      "select /*+ INL_MERGE_JOIN(t1) */ t1.b, t2.b from t1 inner join t2 on t1.a = t2.a;"
+    ]
+  },
+  {
+    "name": "TestHintFromDiffDatabase",
+    "cases": [
+      "select /*+ inl_hash_join(test.t1) */ * from test.t2 join test.t1 on test.t2.a = test.t1.a"
+    ]
+>>>>>>> 5268094... planner: correct the dbName for hint (#15319)
   }
 ]
diff --git a/planner/core/testdata/plan_suite_out.json b/planner/core/testdata/plan_suite_out.json
index 7cd0e753e5d64..5a5f2942cf770 100644
--- a/planner/core/testdata/plan_suite_out.json
+++ b/planner/core/testdata/plan_suite_out.json
@@ -1013,5 +1013,14 @@
         "Best": "Apply{TableReader(Table(t))->IndexJoin{IndexReader(Index(t.c_d_e)[[NULL,+inf]]->HashAgg)->HashAgg->IndexReader(Index(t.g)[[NULL,+inf]])}(test.t3.d,test.t2.g)}->StreamAgg"
       }
     ]
+  },
+  {
+    "Name": "TestHintFromDiffDatabase",
+    "Cases": [
+      {
+        "SQL": "select /*+ inl_hash_join(test.t1) */ * from test.t2 join test.t1 on test.t2.a = test.t1.a",
+        "Plan": "IndexHashJoin{IndexReader(Index(t2.idx_a)[[-inf,+inf]])->IndexReader(Index(t1.idx_a)[[NULL,+inf]]->Sel([not(isnull(test.t1.a))]))}(test.t2.a,test.t1.a)"
+      }
+    ]
   }
 ]