[4.1] support distributed txn free route

src/sql/resolver/cmd/ob_alter_system_resolver.cpp

@@ -2155,6 +2155,9 @@ int ObSetTPResolver::resolve(const ParseNode &parse_tree)
                 stmt->get_rpc_arg().error_code_ = value->value_;
               }
             } break;
+            case T_TP_COND: {        // condition
+              stmt->get_rpc_arg().cond_ = value->value_;
+            } break;
             default:
               break;
             }

src/sql/resolver/ddl/ob_use_database_stmt.h

@@ -55,6 +55,7 @@ public:
   const ObPrivSet& get_db_priv_set() const { return db_priv_set_; }
   void set_db_priv_set(const ObPrivSet &db_priv_set) { db_priv_set_ = db_priv_set; }
   virtual obrpc::ObDDLArg &get_ddl_arg() { return use_database_arg_; }
+  virtual bool cause_implicit_commit() const { return false; }
 private:
   int64_t db_id_;
   common::ObString db_name_;