Pop back a delta with empty rows #9386

libraries/state_history/create_deltas.cpp

@@ -104,6 +104,10 @@ std::vector<table_delta> create_deltas(const chainbase::database& db, bool full_
          for (auto& row : undo.new_values) {
             delta.rows.obj.emplace_back(true, pack_row(row));
          }
+
+         if(delta.rows.obj.empty()) {
+            deltas.pop_back();
+         }
       }
    };
 

unittests/state_history_tests.cpp

@@ -494,6 +494,19 @@ class table_deltas_tester : public tester {
    deltas_vector v;
 };
 
+BOOST_AUTO_TEST_CASE(test_deltas_not_empty) {
+   for (backing_store_type backing_store : { backing_store_type::CHAINBASE/* TODO: uncomment this , backing_store_type::ROCKSDB*/ } ) {
+      table_deltas_tester chain;
+      chain.set_backing_store(backing_store);
+
+      auto deltas = eosio::state_history::create_deltas(chain.control->kv_db(), false);
+
+      for(const auto &delta: deltas) {
+         BOOST_REQUIRE(!delta.rows.obj.empty());
+      }
+   }
+}
+
 BOOST_AUTO_TEST_CASE(test_deltas_account_creation) {
    for (backing_store_type backing_store : { backing_store_type::CHAINBASE, backing_store_type::ROCKSDB }) {
       table_deltas_tester chain;