MaxCompute优化系列-如何解决`无效Join` ?
无效Join判断 比如这个例子: insert overwrite table my_table partition(ds='${bizdate}') select t1.task_type, sum(t1.plan) total, sum(t1.real)/(sum(t1.plan)+0.0001) RPR, sum(t1.plan_A) total_real_mem, sum(t1.real_A)/(sum(t1.plan_A)+0.0001) RPR_A from m1_task t1 left outer join dim_info t2 on t1.project_name=t2.project_name and t1.ds='${bizdate}' and t2.ds='${
