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, 47 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/interface/io.cpp b/yt/cpp/mapreduce/interface/io.cpp
new file mode 100644
index 0000000000..f97629721a
--- /dev/null
+++ b/yt/cpp/mapreduce/interface/io.cpp
@@ -0,0 +1,47 @@
+#include "io.h"
+
+#include <yt/cpp/mapreduce/interface/logging/yt_log.h>
+
+#include <util/string/cast.h>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+TMaybe<size_t> IReaderImplBase::GetReadByteCount() const
+{
+    return Nothing();
+}
+
+i64 IReaderImplBase::GetTabletIndex() const
+{
+    Y_FAIL("Unimplemented");
+}
+
+bool IReaderImplBase::IsEndOfStream() const
+{
+    Y_FAIL("Unimplemented");
+}
+
+bool IReaderImplBase::IsRawReaderExhausted() const
+{
+    Y_FAIL("Unimplemented");
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace NDetail {
+
+void LogTableReaderStatistics(ui64 rowCount, TMaybe<size_t> byteCount)
+{
+    TString byteCountStr = (byteCount ? ::ToString(*byteCount) : "<unknown>");
+    YT_LOG_DEBUG("Table reader has read %v rows, %v bytes",
+        rowCount,
+        byteCountStr);
+}
+
+} // namespace NDetail
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT