YQL-19616: Fix TRegexLexer performance

Fix `TRegexLexer` performance. Now it is just 2 times slower than a reference ANTLR implementation on Release mode, so merged regexes are 3 times better than scan&compare.

![image](https://github.com/user-attachments/assets/4e0cb27a-491d-4dbd-b10a-5725ffa6d902)

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- Related to `YQL-19616`
- Related to https://github.com/ydb-platform/ydb/issues/15129
- Related to https://github.com/vityaman/ydb/issues/42

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Pull Request resolved: https://github.com/ytsaurus/ytsaurus/pull/1278
commit_hash:1529f641172fea13f0d33fbfd06a4827c6efde01

1 files changed, 2 insertions, 1 deletions

diff --git a/yql/essentials/sql/v1/reflect/sql_reflect.h b/yql/essentials/sql/v1/reflect/sql_reflect.h
index 1f67a2f93a3..dec5ff98816 100644
--- a/yql/essentials/sql/v1/reflect/sql_reflect.h
+++ b/yql/essentials/sql/v1/reflect/sql_reflect.h
@@ -13,7 +13,8 @@ namespace NSQLReflect {
         TVector<TString> OtherNames;
         THashMap<TString, TString> BlockByName;
 
-        static const TStringBuf KeywordBlock(const TStringBuf name);
+        static const TStringBuf KeywordBlockByName(const TStringBuf name);
+        static const TString KeywordNameByBlock(const TStringBuf block);
     };
 
     TLexerGrammar LoadLexerGrammar();