cc ydb: fix zero-length array warning from StructMemberNames

commit_hash:75aa2a27a9c10ad59bfc92e483b0f00081888343

Author: Anton3

ydb/include/userver/ydb/io/structs.hpp

@@ -41,6 +41,14 @@ constexpr NotStruct DetectStructMemberNames(Args&&...) noexcept {
     return NotStruct{};
 }
 
+// To avoid including heavy <array> header for std::array<T, 0>.
+template <typename T>
+class EmptyRange final {
+public:
+    constexpr T* begin() const noexcept { return nullptr; }
+    constexpr T* end() const noexcept { return nullptr; }
+};
+
 }  // namespace impl
 
 /// @see ydb::CustomMemberNames
@@ -57,6 +65,13 @@ struct StructMemberNames final {
     CustomMemberName custom_names[N];
 };
 
+/// @cond
+template <>
+struct StructMemberNames<0> final {
+    impl::EmptyRange<CustomMemberName> custom_names;
+};
+/// @endcond
+
 // clang-format off
 StructMemberNames() -> StructMemberNames<0>;
 // clang-format on