YT-19324: move YT provider to ydb/library/yql

This commit is formed by the following script: https://paste.yandex-team.ru/6f92e4b8-efc5-4d34-948b-15ee2accd7e7/text.
This commit has zero effect on all projects that depend on YQL.

The summary of changes:
- `yql/providers/yt -> ydb/library/yql/providers/yt `- the whole implementation of YT provider is moved into YDB code base for further export as a part of YT YQL plugin shared library;
- `yql/providers/stat/{expr_nodes,uploader} -> ydb/library/yql/providers/stat/{expr_nodes,uploader}` - a small interface without implementation and the description of stat expr nodes;
- `yql/core/extract_predicate/ut -> ydb/library/yql/core/extract_predicate/ut`;
- `yql/core/{ut,ut_common} -> ydb/library/yql/core/{ut,ut_common}`;
- `yql/core` is gone;
- `yql/library/url_preprocessing -> ydb/library/yql/core/url_preprocessing`.

**NB**: all new targets inside `ydb/` are under `IF (NOT CMAKE_EXPORT)` clause which disables them from open-source cmake generation and ya make build. They will be enabled in the subsequent commits.

1 files changed, 118 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/common/wait_proxy.cpp b/yt/cpp/mapreduce/common/wait_proxy.cpp
new file mode 100644
index 00000000000..3db034a0980
--- /dev/null
+++ b/yt/cpp/mapreduce/common/wait_proxy.cpp
@@ -0,0 +1,118 @@
+#include "wait_proxy.h"
+
+
+#include <library/cpp/threading/future/future.h>
+
+#include <util/system/event.h>
+#include <util/system/condvar.h>
+
+namespace NYT {
+namespace NDetail {
+
+////////////////////////////////////////////////////////////////////////////////
+
+bool TDefaultWaitProxy::WaitFuture(const NThreading::TFuture<void>& future, TDuration timeout)
+{
+    return future.Wait(timeout);
+}
+
+bool TDefaultWaitProxy::WaitEvent(TSystemEvent& event, TDuration timeout)
+{
+    return event.WaitT(timeout);
+}
+
+bool TDefaultWaitProxy::WaitCondVar(TCondVar &condVar, TMutex &mutex, TDuration timeout)
+{
+    return condVar.WaitT(mutex, timeout);
+}
+
+void TDefaultWaitProxy::Sleep(TDuration timeout)
+{
+    ::Sleep(timeout);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+TWaitProxy::TWaitProxy()
+    : Proxy_(::MakeIntrusive<TDefaultWaitProxy>())
+{ }
+
+TWaitProxy* TWaitProxy::Get()
+{
+    return Singleton<TWaitProxy>();
+}
+
+void TWaitProxy::SetProxy(::TIntrusivePtr<IWaitProxy> proxy)
+{
+    Proxy_ = std::move(proxy);
+}
+
+bool TWaitProxy::WaitFuture(const NThreading::TFuture<void>& future)
+{
+    return Proxy_->WaitFuture(future, TDuration::Max());
+}
+
+bool TWaitProxy::WaitFuture(const NThreading::TFuture<void>& future, TInstant deadLine)
+{
+    return Proxy_->WaitFuture(future, deadLine - TInstant::Now());
+}
+
+bool TWaitProxy::WaitFuture(const NThreading::TFuture<void>& future, TDuration timeout)
+{
+    return Proxy_->WaitFuture(future, timeout);
+}
+
+bool TWaitProxy::WaitEventD(TSystemEvent& event, TInstant deadLine)
+{
+    return Proxy_->WaitEvent(event, deadLine - TInstant::Now());
+}
+
+bool TWaitProxy::WaitEventT(TSystemEvent& event, TDuration timeout)
+{
+    return Proxy_->WaitEvent(event, timeout);
+}
+
+void TWaitProxy::WaitEventI(TSystemEvent& event)
+{
+    Proxy_->WaitEvent(event, TDuration::Max());
+}
+
+bool TWaitProxy::WaitEvent(TSystemEvent& event)
+{
+    return Proxy_->WaitEvent(event, TDuration::Max());
+}
+
+bool TWaitProxy::WaitCondVarD(TCondVar& condVar, TMutex& m, TInstant deadLine)
+{
+    return Proxy_->WaitCondVar(condVar, m, deadLine - TInstant::Now());
+}
+
+bool TWaitProxy::WaitCondVarT(TCondVar& condVar, TMutex& m, TDuration timeOut)
+{
+    return Proxy_->WaitCondVar(condVar, m, timeOut);
+}
+
+void TWaitProxy::WaitCondVarI(TCondVar& condVar, TMutex& m)
+{
+    Proxy_->WaitCondVar(condVar, m, TDuration::Max());
+}
+
+void TWaitProxy::WaitCondVar(TCondVar& condVar, TMutex& m)
+{
+    Proxy_->WaitCondVar(condVar, m, TDuration::Max());
+}
+
+void TWaitProxy::Sleep(TDuration timeout)
+{
+    Proxy_->Sleep(timeout);
+}
+
+void TWaitProxy::SleepUntil(TInstant instant)
+{
+    Proxy_->Sleep(instant - TInstant::Now());
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NDetail
+} // namespace NYT