Better UNION handling in the compile and optimization phase of the access plan.
在访问计划的编译和优化阶段提供更好的UNION处理。
This method can guarantee the generation of optimization execution plan and costs a little.
该方法开销小，且能产生优化的执行规划。
It's a very important and complex issue about optimization of train formation plan.
列车编组计划方案的优化问题，是一个很重要而又复杂的决策问题。
It's a very important and complex issue about optimization of train formation plan.
列车编组计划方案的优化问题，是一个很重要而又复杂的决策问题。
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