diff --git a/src/storage/ob_i_table.cpp b/src/storage/ob_i_table.cpp
index 81633e65ab..9c9cc63102 100644
--- a/src/storage/ob_i_table.cpp
+++ b/src/storage/ob_i_table.cpp
@@ -70,7 +70,11 @@ const char* ObITable::table_type_name_[] =
   "COL_ORIENTED",
   "NORMAL_COL_GROUP",
   "ROWKEY_COL_GROUP",
-  "COL_ORIENTED_META"
+  "COL_ORIENTED_META",
+  "DDL_MERGE_CO",
+  "DDL_MERGE_CG",
+  "DDL_MEM_CO",
+  "DDL_MEM_CG"
 };
 
 uint64_t ObITable::TableKey::hash() const
diff --git a/src/storage/ob_i_table.h b/src/storage/ob_i_table.h
index ee37e6f6aa..da55d0694c 100644
--- a/src/storage/ob_i_table.h
+++ b/src/storage/ob_i_table.h
@@ -97,6 +97,10 @@ public:
     NORMAL_COLUMN_GROUP_SSTABLE = 18,
     ROWKEY_COLUMN_GROUP_SSTABLE = 19,
     COLUMN_ORIENTED_META_SSTABLE = 20,
+    DDL_MERGE_CO_SSTABLE = 21, // used for column store ddl, for base sstable
+    DDL_MERGE_CG_SSTABLE = 22, // used for column store ddl, for normal cg sstable, rowkey cg not supported
+    DDL_MEM_CO_SSTABLE = 23,
+    DDL_MEM_CG_SSTABLE = 24,
     // < add new sstable before here, See is_sstable()
 
     MAX_TABLE_TYPE