lightning: fix cluster index

br/pkg/lightning/restore/meta_manager.go

@@ -1186,9 +1186,12 @@ func getGlobalAutoIDAlloc(store kv.Storage, dbID int64, tblInfo *model.TableInfo
 		return nil, errors.New("internal error: dbID should not be 0")
 	}
 
-	// We don't need the cache here because we allocate all IDs at once.
-	// The argument for CustomAutoIncCacheOption is the cache step. step 1 means no cache.
-	noCache := autoid.CustomAutoIncCacheOption(1)
+	// We don't need autoid cache here because we allocate all IDs at once.
+	// The argument for CustomAutoIncCacheOption is the cache step. Step 1 means no cache,
+	// but step 1 will enable an experimental feature, so we use step 2 here.
+	//
+	// See https://github.com/pingcap/tidb/issues/38442 for more details.
+	noCache := autoid.CustomAutoIncCacheOption(2)
 	tblVer := autoid.AllocOptionTableInfoVersion(tblInfo.Version)
 
 	hasRowID := common.TableHasAutoRowID(tblInfo)

br/tests/lightning_exotic_filenames/data/xfn.etn-schema.sql

@@ -1 +1 @@
-create table `exotic``table````name` (a varchar(6) primary key, b int unique auto_increment) auto_increment=80000;
+create table `exotic``table````name` (a varchar(6) primary key /*T![clustered_index] NONCLUSTERED */, b int unique auto_increment) auto_increment=80000;

br/tests/lightning_exotic_filenames/data/zwk.zwb-schema.sql

@@ -1 +1 @@
-create table 中文表(a int primary key);
+create table 中文表(a int primary key /*T![clustered_index] NONCLUSTERED */);

br/tests/lightning_shard_rowid/data/shard_rowid.shr-schema.sql

@@ -3,5 +3,5 @@ CREATE TABLE `test` (
   `s1` char(10) NOT NULL,
   `s2` char(10) NOT NULL,
   `s3` char(10) DEFAULT NULL,
-  PRIMARY KEY (`s1`,`s2`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin/*!90000 SHARD_ROW_ID_BITS=3 PRE_SPLIT_REGIONS=3 */;
+  PRIMARY KEY (`s1`,`s2`) /*T![clustered_index] NONCLUSTERED */
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin/*!90000 SHARD_ROW_ID_BITS=3 PRE_SPLIT_REGIONS=3 */;

br/tests/lightning_tidb_rowid/data/rowid.non_pk-schema.sql

@@ -1 +1 @@
-create table non_pk (pk varchar(6) primary key);
+create table non_pk (pk varchar(6) primary key /*T![clustered_index] NONCLUSTERED */);

br/tests/lightning_tidb_rowid/data/rowid.non_pk_auto_inc-schema.sql

@@ -4,6 +4,6 @@
 CREATE TABLE `non_pk_auto_inc` (
   `pk` char(36) NOT NULL,
   `id` int(11) NOT NULL AUTO_INCREMENT,
-  PRIMARY KEY (`pk`),
+  PRIMARY KEY (`pk`) /*T![clustered_index] NONCLUSTERED */,
   UNIQUE KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;