External Data Sources: RPC implementation for the describe methods + ydb scheme describe support (#14509)

Author: jepett0

include/ydb-cpp-sdk/client/proto/accessor.h

@@ -43,6 +43,8 @@ class TProtoAccessor {
     static ::google::protobuf::Map<TStringType, Ydb::TypedValue>* GetProtoMapPtr(TParams& params);
     static const Ydb::TableStats::QueryStats& GetProto(const NTable::TQueryStats& queryStats);
     static const Ydb::Table::DescribeTableResult& GetProto(const NTable::TTableDescription& tableDescription);
+    static const Ydb::Table::DescribeExternalDataSourceResult& GetProto(const NTable::TExternalDataSourceDescription&);
+    static const Ydb::Table::DescribeExternalTableResult& GetProto(const NTable::TExternalTableDescription&);
     static const Ydb::Topic::DescribeTopicResult& GetProto(const NYdb::NTopic::TTopicDescription& topicDescription);
     static const Ydb::Topic::DescribeConsumerResult& GetProto(const NYdb::NTopic::TConsumerDescription& consumerDescription);
     static const Ydb::Monitoring::SelfCheckResult& GetProto(const NYdb::NMonitoring::TSelfCheckResult& selfCheckResult);

src/client/table/proto_accessor.cpp

@@ -12,6 +12,14 @@ const Ydb::Table::DescribeTableResult& TProtoAccessor::GetProto(const NTable::TT
     return tableDescription.GetProto();
 }
 
+const Ydb::Table::DescribeExternalDataSourceResult& TProtoAccessor::GetProto(const NTable::TExternalDataSourceDescription& description) {
+    return description.GetProto();
+}
+
+const Ydb::Table::DescribeExternalTableResult& TProtoAccessor::GetProto(const NTable::TExternalTableDescription& description) {
+    return description.GetProto();
+}
+
 NTable::TQueryStats TProtoAccessor::FromProto(const Ydb::TableStats::QueryStats& queryStats) {
     return NTable::TQueryStats(queryStats);
 }