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, 121 insertions, 0 deletions

diff --git a/library/cpp/skiff/skiff_schema.h b/library/cpp/skiff/skiff_schema.h
new file mode 100644
index 0000000000..8952a84bac
--- /dev/null
+++ b/library/cpp/skiff/skiff_schema.h
@@ -0,0 +1,121 @@
+#pragma once
+
+#include "public.h"
+
+#include <util/generic/string.h>
+#include <util/string/cast.h>
+
+#include <vector>
+
+namespace NSkiff {
+
+////////////////////////////////////////////////////////////////////////////////
+
+template <EWireType WireType>
+class TComplexSchema;
+
+using TTupleSchema = TComplexSchema<EWireType::Tuple>;
+using TVariant8Schema = TComplexSchema<EWireType::Variant8>;
+using TVariant16Schema = TComplexSchema<EWireType::Variant16>;
+using TRepeatedVariant8Schema = TComplexSchema<EWireType::RepeatedVariant8>;
+using TRepeatedVariant16Schema = TComplexSchema<EWireType::RepeatedVariant16>;
+
+using TTupleSchemaPtr = std::shared_ptr<TTupleSchema>;
+using TVariant8SchemaPtr = std::shared_ptr<TVariant8Schema>;
+using TVariant16SchemaPtr = std::shared_ptr<TVariant16Schema>;
+using TRepeatedVariant8SchemaPtr = std::shared_ptr<TRepeatedVariant8Schema>;
+using TRepeatedVariant16SchemaPtr = std::shared_ptr<TRepeatedVariant16Schema>;
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TSkiffSchema
+    : public std::enable_shared_from_this<TSkiffSchema>
+{
+public:
+    virtual ~TSkiffSchema() = default;
+
+    EWireType GetWireType() const;
+    std::shared_ptr<TSkiffSchema> SetName(TString name);
+    const TString& GetName() const;
+
+    virtual const TSkiffSchemaList& GetChildren() const;
+
+protected:
+    explicit TSkiffSchema(EWireType type);
+
+private:
+    const EWireType Type_;
+    TString Name_;
+};
+
+bool operator==(const TSkiffSchema& lhs, const TSkiffSchema& rhs);
+bool operator!=(const TSkiffSchema& lhs, const TSkiffSchema& rhs);
+
+////////////////////////////////////////////////////////////////////////////////
+
+class TSimpleTypeSchema
+    : public TSkiffSchema
+{
+public:
+    explicit TSimpleTypeSchema(EWireType type);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+template <EWireType WireType>
+class TComplexSchema
+    : public TSkiffSchema
+{
+public:
+    explicit TComplexSchema(TSkiffSchemaList elements);
+
+    virtual const TSkiffSchemaList& GetChildren() const override;
+
+private:
+    const TSkiffSchemaList Elements_;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+bool IsSimpleType(EWireType type);
+TString GetShortDebugString(const std::shared_ptr<const TSkiffSchema>& schema);
+void PrintShortDebugString(const std::shared_ptr<const TSkiffSchema>& schema, IOutputStream* out);
+
+std::shared_ptr<TSimpleTypeSchema> CreateSimpleTypeSchema(EWireType type);
+std::shared_ptr<TTupleSchema> CreateTupleSchema(TSkiffSchemaList children);
+std::shared_ptr<TVariant8Schema> CreateVariant8Schema(TSkiffSchemaList children);
+std::shared_ptr<TVariant16Schema> CreateVariant16Schema(TSkiffSchemaList children);
+std::shared_ptr<TRepeatedVariant8Schema> CreateRepeatedVariant8Schema(TSkiffSchemaList children);
+std::shared_ptr<TRepeatedVariant16Schema> CreateRepeatedVariant16Schema(TSkiffSchemaList children);
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct TSkiffSchemaPtrHasher
+{
+    size_t operator()(const std::shared_ptr<TSkiffSchema>& schema) const;
+};
+
+struct TSkiffSchemaPtrEqual
+{
+    size_t operator()(
+        const std::shared_ptr<TSkiffSchema>& lhs,
+        const std::shared_ptr<TSkiffSchema>& rhs) const;
+};
+
+} // namespace NSkiff
+
+////////////////////////////////////////////////////////////////////////////////
+
+template <>
+struct THash<NSkiff::TSkiffSchema>
+{
+    size_t operator()(const NSkiff::TSkiffSchema& schema) const;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+
+#define SKIFF_SCHEMA_H
+#include "skiff_schema-inl.h"
+#undef SKIFF_SCHEMA_H