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, 106 insertions, 0 deletions

diff --git a/yt/cpp/mapreduce/interface/protobuf_format.h b/yt/cpp/mapreduce/interface/protobuf_format.h
new file mode 100644
index 0000000000..aafbced386
--- /dev/null
+++ b/yt/cpp/mapreduce/interface/protobuf_format.h
@@ -0,0 +1,106 @@
+#pragma once
+
+#include "common.h"
+
+#include <yt/yt_proto/yt/formats/extension.pb.h>
+
+#include <util/generic/maybe.h>
+
+#include <google/protobuf/message.h>
+
+/// @cond Doxygen_Suppress
+namespace NYT::NDetail {
+
+////////////////////////////////////////////////////////////////////////////////
+
+enum class EProtobufType
+{
+    EnumInt       /* "enum_int" */,
+    EnumString    /* "enum_string" */,
+    Any           /* "any" */,
+    OtherColumns  /* "other_columns" */,
+};
+
+enum class EProtobufSerializationMode
+{
+    Protobuf,
+    Yt,
+    Embedded,
+};
+
+enum class EProtobufListMode
+{
+    Optional,
+    Required,
+};
+
+enum class EProtobufMapMode
+{
+    ListOfStructsLegacy,
+    ListOfStructs,
+    Dict,
+    OptionalDict,
+};
+
+enum class EProtobufFieldSortOrder
+{
+    AsInProtoFile,
+    ByFieldNumber,
+};
+
+enum class EProtobufOneofMode
+{
+    SeparateFields,
+    Variant,
+};
+
+enum class EProtobufEnumWritingMode
+{
+    SkipUnknownValues,
+    CheckValues,
+};
+
+struct TProtobufOneofOptions
+{
+    EProtobufOneofMode Mode = EProtobufOneofMode::Variant;
+    TString VariantFieldName;
+};
+
+struct TProtobufFieldOptions
+{
+    TMaybe<EProtobufType> Type;
+    EProtobufSerializationMode SerializationMode = EProtobufSerializationMode::Protobuf;
+    EProtobufListMode ListMode = EProtobufListMode::Required;
+    EProtobufMapMode MapMode = EProtobufMapMode::ListOfStructsLegacy;
+};
+
+struct TProtobufMessageOptions
+{
+    EProtobufFieldSortOrder FieldSortOrder = EProtobufFieldSortOrder::ByFieldNumber;
+};
+
+TString GetColumnName(const ::google::protobuf::FieldDescriptor& field);
+
+TProtobufFieldOptions GetFieldOptions(
+    const ::google::protobuf::FieldDescriptor* fieldDescriptor,
+    const TMaybe<TProtobufFieldOptions>& defaultFieldOptions = {});
+
+TProtobufOneofOptions GetOneofOptions(
+    const ::google::protobuf::OneofDescriptor* oneofDescriptor,
+    const TMaybe<TProtobufOneofOptions>& defaultOneofOptions = {});
+
+TProtobufMessageOptions GetMessageOptions(const ::google::protobuf::Descriptor* descriptor);
+
+TMaybe<TVector<TString>> InferColumnFilter(const ::google::protobuf::Descriptor& descriptor);
+
+TNode MakeProtoFormatConfigWithTables(const TVector<const ::google::protobuf::Descriptor*>& descriptors);
+TNode MakeProtoFormatConfigWithDescriptors(const TVector<const ::google::protobuf::Descriptor*>& descriptors);
+
+TTableSchema CreateTableSchemaImpl(
+    const ::google::protobuf::Descriptor& messageDescriptor,
+    bool keepFieldsWithoutExtension);
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace NYT::NDetail
+/// @endcond