Null TTableSchemaPtr is serialized as entity

Сейчас если TTableSchemaPtr в yson struct-ах null, то крэшится сериализатор. А в целом для TIntrusivePtr пишется entity. Делаю чтобы для TTableSchemaPtr тоже писался entity
commit_hash:1dde88b3e775a8d542141c775c45585d50526c3a

2 files changed, 16 insertions, 1 deletions

diff --git a/yt/yt/client/table_client/schema_serialization_helpers.cpp b/yt/yt/client/table_client/schema_serialization_helpers.cpp
index e39cae7dc3a..33e40702544 100644
--- a/yt/yt/client/table_client/schema_serialization_helpers.cpp
+++ b/yt/yt/client/table_client/schema_serialization_helpers.cpp
@@ -330,7 +330,7 @@ void Deserialize(TTableSchema& schema, TYsonPullParserCursor* cursor)
 
 void Serialize(const TTableSchemaPtr& schema, IYsonConsumer* consumer)
 {
-    Serialize(*schema, consumer);
+    NYTree::Serialize<TTableSchema>(schema, consumer);
 }
 
 void Deserialize(TTableSchemaPtr& schema, INodePtr node)
diff --git a/yt/yt/client/table_client/unittests/serialization_ut.cpp b/yt/yt/client/table_client/unittests/serialization_ut.cpp
index c3cc622b3e3..038d791b59a 100644
--- a/yt/yt/client/table_client/unittests/serialization_ut.cpp
+++ b/yt/yt/client/table_client/unittests/serialization_ut.cpp
@@ -42,6 +42,21 @@ TEST(TSchemaSerialization, ParseUsingNodeAndSerialize)
 R"RR({"$attributes":{"strict":true,"unique_keys":false},"$value":[{"name":"a","required":false,"type":"int64","type_v3":{"type_name":"optional","item":"int64"}},{"stable_name":"b","deleted":true}]})RR");
 }
 
+TEST(TSchemaSerialization, ParseEntityUsingNodeAndSerialize)
+{
+    NYT::NFormats::TFormat format(NFormats::EFormatType::Json);
+
+    TBlobOutput buffer;
+    auto consumer = CreateConsumerForFormat(format, NFormats::EDataType::Structured, &buffer);
+
+    Serialize(TTableSchemaPtr{}, consumer.get());
+    consumer->Flush();
+    auto ref = buffer.Flush();
+    auto buf = ref.ToStringBuf();
+
+    EXPECT_EQ(TString(buf.data(), buf.size()), "null");
+}
+
 TEST(TSchemaSerialization, Cursor)
 {
     const char* schemaString = "<strict=%true;unique_keys=%false>"