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oceanbase/src/sql/engine
zzg19950727 3cada22bdc [FEAT MERGE]4_2_sql_feature
Co-authored-by: yinyj17 <yinyijun92@gmail.com>
Co-authored-by: xianyu-w <707512433@qq.com>
Co-authored-by: jingtaoye35 <1255153887@qq.com>
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See `ob_physical_plan.h' and `ob_phy_operator.h' for the interfaces of this module.

ObPhysicalPlan内存管理约束:
要求同一个phy_plan中的所有内存空间都从同一个allocator中进行分配,在析构phy_plan的时候并不会调用其他
成员的析构函数,而是直接调用allocator.clear(),直接将所有空间释放掉;
以后添加任何新的成员的时候,也必须从phy_plan的allocator中申请空间。否则会造成内存泄露,这里说的新成员
不仅包括phy_plan类的成员,也包括phy_op/sql_expression/expr_op等所有隶属于同一个phy_plan对象内的所有内容;