Add ut

dbms/src/TiDB/Schema/tests/gtest_schema_sync.cpp

@@ -29,6 +29,7 @@
 #include <TestUtils/TiFlashTestEnv.h>
 #include <TiDB/Schema/SchemaSyncService.h>
 #include <common/defines.h>
+#include <common/types.h>
 
 #include <ext/scope_guard.h>
 
@@ -418,13 +419,24 @@ try
         FailPointHelper::disableFailPoint(FailPoints::force_schema_sync_too_old_schema);
     });
     refreshSchema();
-    auto tombstone_ts_by_sync_all = 0;
+    UInt64 tombstone_ts_by_sync_all = 0;
     {
         // the table should mark as tombstone != 0
         auto storage = mustGetSyncedTable(logical_table_id);
         tombstone_ts_by_sync_all = storage->getTombstone();
         ASSERT_NE(tombstone_ts_by_sync_all, 0);
     }
+
+    // trigger sync all schema again, the tombstone_ts should not change
+    MockTiDB::instance().newDataBase(db_name + "_copy");
+    refreshSchema();
+    {
+        // the table should mark as tombstone != 0
+        auto storage = mustGetSyncedTable(logical_table_id);
+        ASSERT_NE(storage->getTombstone(), 0);
+        // the tombstone_ts should not changed
+        ASSERT_EQ(storage->getTombstone(), tombstone_ts_by_sync_all);
+    }
 }
 CATCH