Start from scratch: Start with an empty set of conditions and add your own.
从头开始：从一组空的条件开始并添加您自己的条件。
When you invoke a Groovy method that has no parameters, you must call it with an empty set of parentheses, which allows Groovy to distinguish between a property access from a method call.
当您调用一个没有参数的Groovy方法时，您必须使用一对空括号调用它，这使得Groovy可以分清一个属性访问和一个方法调用之间的区别。
Note that these 32 subsets include T itself and the empty set, which contains no elements at all.
应该注意到这32个子集中包含T本身和空集（空集即不含任何元素的集合）。
This process is known as "index matching" and produces a (possibly empty) set of eligible indexes for the given query.
该过程被称为 “索引匹配”，并且为给定的查询生成一组合适的索引（可能是空集）。
This process is known as "index matching" and produces a (possibly empty) set of eligible indexes for the given query.
该过程被称为 “索引匹配”，并且为给定的查询生成一组合适的索引（可能是空集）。
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