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, 72 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/io/node_table_writer.cpp b/yt/cpp/mapreduce/io/node_table_writer.cpp
new file mode 100644
index 00000000000..dcb5a0f5b5e
--- /dev/null
+++ b/yt/cpp/mapreduce/io/node_table_writer.cpp
@@ -0,0 +1,72 @@
+#include "node_table_writer.h"
+
+#include <yt/cpp/mapreduce/common/node_visitor.h>
+
+#include <yt/cpp/mapreduce/interface/io.h>
+
+#include <yt/cpp/mapreduce/interface/logging/yt_log.h>
+
+#include <library/cpp/yson/writer.h>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+TNodeTableWriter::TNodeTableWriter(THolder<IProxyOutput> output, NYson::EYsonFormat format)
+    : Output_(std::move(output))
+{
+    for (size_t i = 0; i < Output_->GetStreamCount(); ++i) {
+        Writers_.push_back(
+            MakeHolder<::NYson::TYsonWriter>(Output_->GetStream(i), format, NYT::NYson::EYsonType::ListFragment));
+    }
+}
+
+TNodeTableWriter::~TNodeTableWriter()
+{ }
+
+size_t TNodeTableWriter::GetTableCount() const
+{
+    return Output_->GetStreamCount();
+}
+
+void TNodeTableWriter::FinishTable(size_t tableIndex) {
+    Output_->GetStream(tableIndex)->Finish();
+}
+
+void TNodeTableWriter::AddRow(const TNode& row, size_t tableIndex)
+{
+    if (row.HasAttributes()) {
+        ythrow TIOException() << "Row cannot have attributes";
+    }
+
+    static const TNode emptyMap = TNode::CreateMap();
+    const TNode* outRow = &emptyMap;
+    if (row.GetType() != TNode::Undefined) {
+        if (!row.IsMap()) {
+            ythrow TIOException() << "Row should be a map node";
+        } else {
+            outRow = &row;
+        }
+    }
+
+    auto* writer = Writers_[tableIndex].Get();
+    writer->OnListItem();
+
+    TNodeVisitor visitor(writer);
+    visitor.Visit(*outRow);
+
+    Output_->OnRowFinished(tableIndex);
+}
+
+void TNodeTableWriter::AddRow(TNode&& row, size_t tableIndex) {
+    AddRow(row, tableIndex);
+}
+
+void TNodeTableWriter::Abort()
+{
+    Output_->Abort();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT