solve the problem of table_factory_to_write_=nullptr (#1342)

table/adaptive_table_factory.cc

@@ -20,9 +20,6 @@ AdaptiveTableFactory::AdaptiveTableFactory(
       block_based_table_factory_(block_based_table_factory),
       plain_table_factory_(plain_table_factory),
       cuckoo_table_factory_(cuckoo_table_factory) {
-  if (!table_factory_to_write_) {
-    table_factory_to_write_ = block_based_table_factory_;
-  }
   if (!plain_table_factory_) {
     plain_table_factory_.reset(NewPlainTableFactory());
   }
@@ -32,6 +29,9 @@ AdaptiveTableFactory::AdaptiveTableFactory(
   if (!cuckoo_table_factory_) {
     cuckoo_table_factory_.reset(NewCuckooTableFactory());
   }
+  if (!table_factory_to_write_) {
+    table_factory_to_write_ = block_based_table_factory_;
+  }
 }
 
 extern const uint64_t kPlainTableMagicNumber;