[FEAT MERGE] add direct load function

Co-authored-by: Monk-Liu <1152761042@qq.com>
Co-authored-by: saltonz <saltonzh@gmail.com>
Co-authored-by: yongshige <598633031@qq.com>

unittest/storage/backup/test_backup_iterator.cpp

@@ -73,7 +73,7 @@ protected:
 
 
 TestBackupIndexIterator::TestBackupIndexIterator()
-    : TestDataFilePrepare(&getter, "TestBackupIndexIterator"),
+    : TestDataFilePrepare(&getter, "TestBackupIndexIterator", OB_DEFAULT_MACRO_BLOCK_SIZE, 500),
       tenant_base_(500),
       job_desc_(),
       backup_dest_(),
@@ -344,4 +344,4 @@ int main(int argc, char **argv)
   OB_LOGGER.set_log_level("INFO");
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
-}
+}