From 33d19114021ff49bf8f2f9447715aea6972339ab Mon Sep 17 00:00:00 2001
From: Michael Kolupaev <mkolupaev@yandex-team.ru>
Date: Fri, 21 Jun 2013 11:44:44 +0000
Subject: [PATCH] clickhouse: slightly fixed sign-rewrite exception
 [#CONV-7962].

---
 dbms/src/Interpreters/ExpressionAnalyzer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dbms/src/Interpreters/ExpressionAnalyzer.cpp b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
index 8897e90a2d..164031a287 100644
--- a/dbms/src/Interpreters/ExpressionAnalyzer.cpp
+++ b/dbms/src/Interpreters/ExpressionAnalyzer.cpp
@@ -352,7 +352,7 @@ void ExpressionAnalyzer::normalizeTreeImpl(ASTPtr & ast, MapOfASTs & finished_as
 			else
 			{
 				/// Проверим имеет ли смысл sign-rewrite
-				if (!in_sign_rewritten && node->name == sign_column_name)
+				if (!in_sign_rewritten && sign_column_name != "" && node->name == sign_column_name)
 					throw Exception("Requested Sign column while sign-rewrite is on.", ErrorCodes::QUERY_SECTION_DOESNT_MAKE_SENSE);
 			}
 		}
-- 
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