执行计划一：
explain plan set statement_id ='test1' into plan_table for …
select operation,options,object_name,object_type,id,parent_id,position,cost,cardinality,cpu_cost,io_cost
from plan_table where statement_id='test1'
执行计划二：
explain plan set statement_id ='test2' into plan_table for …
select * from table(dbms_xplan.display('plan_table','test2'))
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