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, 34 insertions, 0 deletions

diff --git a/library/cpp/yson_pull/bridge.h b/library/cpp/yson_pull/bridge.h
new file mode 100644
index 0000000000..ac767dcba0
--- /dev/null
+++ b/library/cpp/yson_pull/bridge.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "consumer.h"
+#include "event.h"
+#include "writer.h"
+
+namespace NYsonPull {
+    //! \brief Connect YSON stream producer and consumer.
+    //!
+    //! Useful for writing YSON stream filters.
+    //! \p Producer must have a \p next_event() method (like \p NYsonPull::reader).
+    //! \p Consumer must be like \p NYsonPull::consumer interface.
+    template <typename Producer, typename Consumer>
+    inline void Bridge(Producer&& producer, Consumer&& consumer) {
+        for (;;) {
+            auto& event = producer.NextEvent();
+            consumer.OnEvent(event);
+            if (event.Type() == EEventType::EndStream) {
+                break;
+            }
+        }
+    }
+
+    template <typename Producer>
+    inline void Bridge(Producer&& producer, TWriter& writer_) {
+        Bridge(std::forward<Producer>(producer), writer_.GetConsumer());
+    }
+
+    template <typename Producer>
+    inline void Bridge(Producer&& producer, TWriter&& writer_) {
+        Bridge(std::forward<Producer>(producer), writer_.GetConsumer());
+    }
+
+}