是否有方法确定执行查询所需的作业总数。
例如，在下面的2个查询中，联接数和子查询数相同，但一个查询需要2个作业，而另一个查询需要3个作业

select t1.item_dim_key hive, t2.item_dim_key as monet 
   from ext_dist_it_dim_key t1 
        left outer join (select distinct item_dim_key from PO_ITEM_DIM) t2 on t1.item_dim_key=t2.item_dim_key 
   where t2.item_dim_key is null;

WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.
Query ID = 20190208020329_258ee4c0-5819-4842-b479-d549c82a0779

**Total jobs = 3**

hive> select t1.item_dim_key hive, t2.item_dim_key as monet 
       from (select distinct item_dim_key from PO_ITEM_DIM) t1 
            left outer join ext_dist_it_dim_key t2 on t1.item_dim_key=t2.item_dim_key 
      where t2.item_dim_key is null;

WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.
Query ID = 20190208020624_9ea3dc20-ffc8-4461-9516-7a4770d1dd6b

**Total jobs = 2**

是否可以知道执行一个查询需要多少个作业？计算作业数所需的参数是什么。
谢谢