[CP] [bugfix] Assigning ObRawExprPointer eats error code

src/sql/resolver/expr/ob_raw_expr.cpp

@@ -5403,6 +5403,11 @@ int ObRawExprPointer::add_ref(ObRawExpr **expr)
   return expr_group_.push_back(expr);
 }
 
+int ObRawExprPointer::assign(const ObRawExprPointer &other)
+{
+  return expr_group_.assign(other.expr_group_);
+}
+
 int ObMultiSetRawExpr::assign(const ObRawExpr &other)
 {
   int ret = OB_SUCCESS;

src/sql/resolver/expr/ob_raw_expr.h

@@ -4426,6 +4426,7 @@ public:
   int get(ObRawExpr *&expr);
   int set(ObRawExpr *expr);
   int add_ref(ObRawExpr **expr);
+  int assign(const ObRawExprPointer &other);
   TO_STRING_KV("", "");
 private:
   common::ObSEArray<ObRawExpr **, 1> expr_group_;