优先排序器：应用于数据块与加载以确定处理顺序的一个规则与优先级列表。
Prioritizer: a list of rules and priorities applied to chunks and loads to determine order of processing.
定义了列的查询元素表中的行顺序决定了它们在ORDER BY子句中从左到右的顺序，这又确定了它们的排序优先级。
The row order in the query elements table in which columns are defined determines their left to right sequence within the order BY clause, which in turn determines their sorting priority.
更成熟的方案可以使用一个优先级分数来确定执行顺序，但原型的主要目标是简单明了。
A more sophisticated scheme could use a prioritization score to determine the order of execution, but a main goal of the prototype is simplicity.
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