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1:解决mtr:main.opt_hints_join_order,main.temptable,opt_trace.subquery_no_prot.main.opt_hints_subquery增加loosescan功能。
2: 优化部分拷贝函数。
3:修改部分mtr的结果,之前的把错误的并行结果当作了正确的结果。
fixes: #77