Moved "Allow Read table call returns not null type" commit from ydb repo

Author: dcherednik

include/ydb-cpp-sdk/client/table/table.h

@@ -1575,6 +1575,8 @@ struct TReadTableSettings : public TRequestSettings<TReadTableSettings> {
     FLUENT_SETTING_OPTIONAL(ui64, BatchLimitBytes);
 
     FLUENT_SETTING_OPTIONAL(ui64, BatchLimitRows);
+
+    FLUENT_SETTING_OPTIONAL(bool, ReturnNotNullAsOptional);
 };
 
 //! Represents all session operations

src/api/protos/ydb_table.proto

@@ -1070,6 +1070,7 @@ message ReadTableRequest {
     // greater than any of the limits
     uint64 batch_limit_bytes = 8;
     uint64 batch_limit_rows = 9;
+    Ydb.FeatureFlag.Status return_not_null_data_as_optional = 10;
 }
 
 // ReadTable doesn't use Operation, returns result directly

src/client/table/impl/table_client.cpp

@@ -786,6 +786,13 @@ NThreading::TFuture<std::pair<TPlainStatus, TTableClient::TImpl::TReadTableStrea
         request.set_batch_limit_rows(*settings.BatchLimitRows_);
     }
 
+    if (settings.ReturnNotNullAsOptional_) {
+        request.set_return_not_null_data_as_optional(
+            settings.ReturnNotNullAsOptional_.value()
+            ? Ydb::FeatureFlag::ENABLED
+            : Ydb::FeatureFlag::DISABLED);
+    }
+
     auto promise = NewPromise<std::pair<TPlainStatus, TReadTableStreamProcessorPtr>>();
 
     Connections_->StartReadStream<Ydb::Table::V1::TableService, Ydb::Table::ReadTableRequest, Ydb::Table::ReadTableResponse>(