diff --git a/dbms/include/DB/Interpreters/ExpressionAnalyzer.h b/dbms/include/DB/Interpreters/ExpressionAnalyzer.h
index af2e19c8af4..c4b01ffe0ba 100644
--- a/dbms/include/DB/Interpreters/ExpressionAnalyzer.h
+++ b/dbms/include/DB/Interpreters/ExpressionAnalyzer.h
@@ -215,11 +215,6 @@ private:
 	void normalizeTree();
 	void normalizeTreeImpl(ASTPtr & ast, MapOfASTs & finished_asts, SetOfASTs & current_asts, std::string current_alias);
 
-	/** Заменить все цепочки вида c = x1 OR c = x2 OR ... OR c = xN на выражения c IN (x1, x2, ..., xN),
-	  * где c - произвольное выражение; x1, x2, ... xN - литералы одного типа.
-	  */
-	void optimizeDisjunctiveEqualityChains();
-
 	///	Eliminates injective function calls and constant expressions from group by statement
 	void optimizeGroupBy();