question: public static _Fields findByThriftId ( int fieldId ) { switch ( fieldId ) { case 1 : return AVERAGE_LOAD ; case 2 : return OLD_GC ; case 3 : return THREAD_NUM ; case 4 : return QUEUE_SIZE ; case 5 : return METHOD_QPS_MAP ; default : return null ; } }
target:  Find the _Fields constant that matches fieldId, or null if its not found.