YT-19210: expose YQL shared library for YT.

After this, a new target libyqlplugin.so appears. in open-source cmake build.
Diff in open-source YDB repo looks like the following: https://paste.yandex-team.ru/f302bdb4-7ef2-4362-91c7-6ca45f329264

1 files changed, 73 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/interface/mpl.h b/yt/cpp/mapreduce/interface/mpl.h
new file mode 100644
index 00000000000..9865e28b6c3
--- /dev/null
+++ b/yt/cpp/mapreduce/interface/mpl.h
@@ -0,0 +1,73 @@
+#pragma once
+
+#include "fwd.h"
+
+#include <tuple>
+#include <type_traits>
+
+namespace NYT {
+
+/// @cond Doxygen_Suppress
+
+////////////////////////////////////////////////////////////////////////////////
+
+template <class TBase, class TDerived>
+struct TIsBaseOf
+{
+    static constexpr bool Value = std::is_base_of_v<TBase, TDerived> && !std::is_same_v<TBase, TDerived>;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace NDetail {
+
+template <class T, class Tuple>
+struct TIndexInTuple;
+
+template <class T, class... Types>
+struct TIndexInTuple<T, std::tuple<T, Types...>>
+{
+    static constexpr int Value = 0;
+};
+
+template <class T>
+struct TIndexInTuple<T, std::tuple<>>
+{
+    static constexpr int Value = 0;
+};
+
+template <class T, class U, class... Types>
+struct TIndexInTuple<T, std::tuple<U, Types...>>
+{
+    static constexpr int Value = 1 + TIndexInTuple<T, std::tuple<Types...>>::Value;
+};
+
+template <class T, class TTuple>
+constexpr bool DoesTupleContainType = (TIndexInTuple<T, TTuple>::Value < std::tuple_size<TTuple>{});
+
+template <class TOut, class TIn = std::tuple<>>
+struct TUniqueTypes;
+
+template <class... TOut, class TInCar, class... TInCdr>
+struct TUniqueTypes<std::tuple<TOut...>, std::tuple<TInCar, TInCdr...>>
+{
+    using TType = std::conditional_t<
+        DoesTupleContainType<TInCar, std::tuple<TOut...>>,
+        typename TUniqueTypes<std::tuple<TOut...>, std::tuple<TInCdr...>>::TType,
+        typename TUniqueTypes<std::tuple<TOut..., TInCar>, std::tuple<TInCdr...>>::TType
+    >;
+};
+
+template <class TOut>
+struct TUniqueTypes<TOut, std::tuple<>>
+{
+    using TType = TOut;
+};
+
+} // namespace NDetail
+
+/// @endcond Doxygen_Suppress
+
+////////////////////////////////////////////////////////////////////////////////
+
+}