[SCN] fix farm failure

src/sql/ob_sql.h

@@ -58,6 +58,24 @@ class ObIVirtualTableIteratorFactory;
 struct ObSqlCtx;
 class ObResultSet;
 
+class ObPlanBaseKeyGuard
+{
+public:
+  explicit ObPlanBaseKeyGuard(ObBaselineKey &bl_key)
+    : bl_key_(bl_key),
+      ori_bl_key_(bl_key) {}
+  ~ObPlanBaseKeyGuard()
+  {
+    bl_key_ = ori_bl_key_;
+  }
+private:
+  // disallow copy
+  ObPlanBaseKeyGuard(const ObPlanBaseKeyGuard &other);
+private:
+  ObBaselineKey &bl_key_;
+  ObBaselineKey ori_bl_key_;
+};
+
 // this class is the main interface for sql module
 class ObSql
 {