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, 126 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/common/helpers.cpp b/yt/cpp/mapreduce/common/helpers.cpp
new file mode 100644
index 00000000000..95924d812c9
--- /dev/null
+++ b/yt/cpp/mapreduce/common/helpers.cpp
@@ -0,0 +1,126 @@
+#include "helpers.h"
+
+#include <yt/cpp/mapreduce/interface/config.h>
+#include <yt/cpp/mapreduce/interface/serialize.h>
+#include <yt/cpp/mapreduce/interface/fluent.h>
+
+#include <library/cpp/yson/node/node_builder.h>
+#include <library/cpp/yson/node/node_visitor.h>
+
+#include <library/cpp/yson/parser.h>
+#include <library/cpp/yson/writer.h>
+
+#include <library/cpp/json/json_reader.h>
+#include <library/cpp/json/json_value.h>
+
+#include <util/stream/input.h>
+#include <util/stream/output.h>
+#include <util/stream/str.h>
+
+namespace NYT {
+
+////////////////////////////////////////////////////////////////////////////////
+
+TString NodeListToYsonString(const TNode::TListType& nodes)
+{
+    TStringStream stream;
+    ::NYson::TYsonWriter writer(&stream, NYson::EYsonFormat::Binary, ::NYson::EYsonType::ListFragment);
+    auto list = BuildYsonListFluently(&writer);
+    for (const auto& node : nodes) {
+        list.Item().Value(node);
+    }
+    return stream.Str();
+}
+
+TNode PathToNode(const TRichYPath& path)
+{
+    TNode result;
+    TNodeBuilder builder(&result);
+    Serialize(path, &builder);
+    return result;
+}
+
+TNode PathToParamNode(const TRichYPath& path)
+{
+    return TNode()("path", PathToNode(path));
+}
+
+TString AttributesToYsonString(const TNode& node)
+{
+    return BuildYsonStringFluently().BeginMap()
+        .Item("attributes").Value(node)
+    .EndMap();
+}
+
+TString AttributeFilterToYsonString(const TAttributeFilter& filter)
+{
+    return BuildYsonStringFluently().BeginMap()
+        .Item("attributes").Value(filter)
+    .EndMap();
+}
+
+TNode NodeFromTableSchema(const TTableSchema& schema)
+{
+    TNode result;
+    TNodeBuilder builder(&result);
+    Serialize(schema, &builder);
+    return result;
+}
+
+void MergeNodes(TNode& dst, const TNode& src)
+{
+    if (dst.IsMap() && src.IsMap()) {
+        auto& dstMap = dst.AsMap();
+        const auto& srcMap = src.AsMap();
+        for (const auto& srcItem : srcMap) {
+            const auto& key = srcItem.first;
+            auto dstItem = dstMap.find(key);
+            if (dstItem != dstMap.end()) {
+                MergeNodes(dstItem->second, srcItem.second);
+            } else {
+                dstMap[key] = srcItem.second;
+            }
+        }
+    } else {
+        if (dst.GetType() == src.GetType() && src.HasAttributes()) {
+            auto attributes = dst.GetAttributes();
+            MergeNodes(attributes, src.GetAttributes());
+            dst = src;
+            dst.Attributes() = attributes;
+        } else {
+            dst = src;
+        }
+    }
+}
+
+TYPath AddPathPrefix(const TYPath& path, const TString& pathPrefix)
+{
+    if (path.StartsWith("//") || path.StartsWith("#")) {
+        return path;
+    }
+    return pathPrefix + path;
+}
+
+TString GetWriteTableCommand(const TString& apiVersion)
+{
+    return apiVersion == "v2" ? "write" : "write_table";
+}
+
+TString GetReadTableCommand(const TString& apiVersion)
+{
+    return apiVersion == "v2" ? "read" : "read_table";
+}
+
+TString GetWriteFileCommand(const TString& apiVersion)
+{
+    return apiVersion == "v2" ? "upload" : "write_file";
+}
+
+TString GetReadFileCommand(const TString& apiVersion)
+{
+    return apiVersion == "v2" ? "download" : "read_file";
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT