diff --git a/dbms/src/TableFunctions/ITableFunction.h b/dbms/src/TableFunctions/ITableFunction.h
index d9cf2f3507d027e9f4b4d6a8b5c393bdf1d54d51..912a9ee864260baad7127e11d6bfc8d0506b370c 100644
--- a/dbms/src/TableFunctions/ITableFunction.h
+++ b/dbms/src/TableFunctions/ITableFunction.h
@@ -32,7 +32,7 @@ public:
     virtual std::string getName() const = 0;
 
     /// Create storage according to the query
-    virtual StoragePtr execute(ASTPtr ast_function, const Context & context) const = 0;
+    virtual StoragePtr execute(const ASTPtr & ast_function, const Context & context) const = 0;
 
     virtual ~ITableFunction() {};
 };
diff --git a/dbms/src/TableFunctions/TableFunctionMerge.cpp b/dbms/src/TableFunctions/TableFunctionMerge.cpp
index 80102fbfbd9c7e5981a7cc62dc87c24f78ec6c12..dcda825131f176aeac0bc73047162efb000113fd 100644
--- a/dbms/src/TableFunctions/TableFunctionMerge.cpp
+++ b/dbms/src/TableFunctions/TableFunctionMerge.cpp
@@ -53,7 +53,7 @@ static NamesAndTypesList chooseColumns(const String & source_database, const Str
 }
 
 
-StoragePtr TableFunctionMerge::execute(ASTPtr ast_function, const Context & context) const
+StoragePtr TableFunctionMerge::execute(const ASTPtr & ast_function, const Context & context) const
 {
     ASTs & args_func = typeid_cast<ASTFunction &>(*ast_function).children;
 
diff --git a/dbms/src/TableFunctions/TableFunctionMerge.h b/dbms/src/TableFunctions/TableFunctionMerge.h
index fd8ea29be149ccf86240154fd295b5d9a9cb4fd8..922bef32380bf4d73c12849ca066dd13114253dc 100644
--- a/dbms/src/TableFunctions/TableFunctionMerge.h
+++ b/dbms/src/TableFunctions/TableFunctionMerge.h
@@ -14,7 +14,7 @@ class TableFunctionMerge: public ITableFunction
 {
 public:
     std::string getName() const override { return "merge"; }
-    StoragePtr execute(ASTPtr ast_function, const Context & context) const override;
+    StoragePtr execute(const ASTPtr & ast_function, const Context & context) const override;
 };
 
 
diff --git a/dbms/src/TableFunctions/TableFunctionRemote.cpp b/dbms/src/TableFunctions/TableFunctionRemote.cpp
index 77bcb3aeae289edd4c051659fc82b166a185131d..13796f64622f644a98116b299534dc10ae58c4fb 100644
--- a/dbms/src/TableFunctions/TableFunctionRemote.cpp
+++ b/dbms/src/TableFunctions/TableFunctionRemote.cpp
@@ -179,7 +179,7 @@ static std::vector<String> parseDescription(const String & description, size_t l
 }
 
 
-StoragePtr TableFunctionRemote::execute(ASTPtr ast_function, const Context & context) const
+StoragePtr TableFunctionRemote::execute(const ASTPtr & ast_function, const Context & context) const
 {
     ASTs & args_func = typeid_cast<ASTFunction &>(*ast_function).children;
 
diff --git a/dbms/src/TableFunctions/TableFunctionRemote.h b/dbms/src/TableFunctions/TableFunctionRemote.h
index 1efa423cf77ad6b0eb498378ddaf30fd4ad95e34..53bd75d78b3fd2898ea8fe43d45c9a919652f6a7 100644
--- a/dbms/src/TableFunctions/TableFunctionRemote.h
+++ b/dbms/src/TableFunctions/TableFunctionRemote.h
@@ -16,7 +16,7 @@ class TableFunctionRemote : public ITableFunction
 {
 public:
     std::string getName() const override { return "remote"; }
-    StoragePtr execute(ASTPtr ast_function, const Context & context) const override;
+    StoragePtr execute(const ASTPtr & ast_function, const Context & context) const override;
 };
 
 }
diff --git a/dbms/src/TableFunctions/TableFunctionShardByHash.cpp b/dbms/src/TableFunctions/TableFunctionShardByHash.cpp
index 9dc41977ea6d068b439d0247d0f9c162f83a2c35..bd5f90c79302ff82c4893bcaf0174a7655501adb 100644
--- a/dbms/src/TableFunctions/TableFunctionShardByHash.cpp
+++ b/dbms/src/TableFunctions/TableFunctionShardByHash.cpp
@@ -20,7 +20,7 @@ namespace ErrorCodes
     extern const int BAD_ARGUMENTS;
 }
 
-StoragePtr TableFunctionShardByHash::execute(ASTPtr ast_function, const Context & context) const
+StoragePtr TableFunctionShardByHash::execute(const ASTPtr & ast_function, const Context & context) const
 {
     ASTs & args_func = typeid_cast<ASTFunction &>(*ast_function).children;
 
diff --git a/dbms/src/TableFunctions/TableFunctionShardByHash.h b/dbms/src/TableFunctions/TableFunctionShardByHash.h
index 6436f87b0a3b71be0303b7e341b4ef5eb36d8424..1723f0a67a01a8b246782a734442044ee255b99c 100644
--- a/dbms/src/TableFunctions/TableFunctionShardByHash.h
+++ b/dbms/src/TableFunctions/TableFunctionShardByHash.h
@@ -15,7 +15,7 @@ class TableFunctionShardByHash : public ITableFunction
 {
 public:
     std::string getName() const override { return "shardByHash"; }
-    StoragePtr execute(ASTPtr ast_function, const Context & context) const override;
+    StoragePtr execute(const ASTPtr & ast_function, const Context & context) const override;
 };
 
 }