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, 30 insertions, 0 deletions

diff --git a/library/cpp/erasure/helpers.h b/library/cpp/erasure/helpers.h
new file mode 100644
index 00000000000..741186322a1
--- /dev/null
+++ b/library/cpp/erasure/helpers.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include "public.h"
+
+namespace NErasure {
+
+// All vectors here are assumed to be sorted.
+
+TPartIndexList MakeSegment(int begin, int end);
+
+TPartIndexList MakeSingleton(int elem);
+
+TPartIndexList Difference(int begin, int end, const TPartIndexList& subtrahend);
+
+TPartIndexList Difference(const TPartIndexList& first, const TPartIndexList& second);
+
+TPartIndexList Difference(const TPartIndexList& first, int elem);
+
+TPartIndexList Intersection(const TPartIndexList& first, const TPartIndexList& second);
+
+TPartIndexList Union(const TPartIndexList& first, const TPartIndexList& second);
+
+bool Contains(const TPartIndexList& set, int elem);
+
+TPartIndexList UniqueSortedIndices(const TPartIndexList& indices);
+
+TPartIndexList ExtractRows(const TPartIndexList& matrix, int width, const TPartIndexList& rows);
+
+} // namespace NErasure
+