executor: fix flashback table faild in uppercase d ... (#17093) (#17167)

executor/ddl.go

@@ -500,7 +500,7 @@ func (e *DDLExec) getRecoverTableByTableName(tableName *ast.TableName) (*model.J
 	}
 	schemaName := tableName.Schema.L
 	if schemaName == "" {
-		schemaName = e.ctx.GetSessionVars().CurrentDB
+		schemaName = strings.ToLower(e.ctx.GetSessionVars().CurrentDB)
 	}
 	if schemaName == "" {
 		return nil, nil, errors.Trace(core.ErrNoDB)
@@ -518,9 +518,7 @@ func (e *DDLExec) getRecoverTableByTableName(tableName *ast.TableName) (*model.J
 		}
 		schema, ok := dom.InfoSchema().SchemaByID(job.SchemaID)
 		if !ok {
-			return true, infoschema.ErrDatabaseNotExists.GenWithStackByArgs(
-				fmt.Sprintf("(Schema ID %d)", job.SchemaID),
-			)
+			return false, nil
 		}
 		if schema.Name.L == schemaName {
 			tableInfo = tblInfo

executor/executor_test.go

@@ -4813,6 +4813,27 @@ func (s *testRecoverTable) TestFlashbackTable(c *C) {
 	// Check flashback table autoID.
 	tk.MustExec("insert into t_p_flashback1 values (6)")
 	tk.MustQuery("select a,_tidb_rowid from t_p_flashback1 order by a;").Check(testkit.Rows("1 1", "2 2", "3 3", "4 5001", "5 5002", "6 10001"))
+
+	tk.MustExec("drop database if exists Test2")
+	tk.MustExec("create database Test2")
+	tk.MustExec("use Test2")
+	tk.MustExec("create table t (a int);")
+	tk.MustExec("insert into t values (1),(2)")
+	tk.MustExec("drop table t")
+	tk.MustExec("flashback table t")
+	tk.MustQuery("select a from t order by a").Check(testkit.Rows("1", "2"))
+
+	tk.MustExec("drop table t")
+	tk.MustExec("drop database if exists Test3")
+	tk.MustExec("create database Test3")
+	tk.MustExec("use Test3")
+	tk.MustExec("create table t (a int);")
+	tk.MustExec("drop table t")
+	tk.MustExec("drop database Test3")
+	tk.MustExec("use Test2")
+	tk.MustExec("flashback table t")
+	tk.MustExec("insert into t values (3)")
+	tk.MustQuery("select a from t order by a").Check(testkit.Rows("1", "2", "3"))
 }
 
 func (s *testSuiteP2) TestPointGetPreparedPlan(c *C) {