The Join object has left-side attributes and right-side attributes, which are compared to each other to form join predicates.
联结对象具有左属性和右属性，对这两个属性进行比较，从而形成联结谓词。
Generate the expression for the join predicate by applying the join operator to the expressions for the left and right attributes.
将联结操作符应用于左右属性的表达式，从而产生联结谓词的表达式。
If the facts object contains any join references, then look at each of these join objects and keep track of all attributes from both the left and right sides of these joins.
如果事实对象包含任何联结引用，那么要查看每个联结对象，记录这些联结左右两边的所有属性。
For example, the join class contains a left-join expression, a right-join expression, a join type, and a join criteria.
举例来说，join类包含一个左连接表达式、一个右连接表达式、一个连接类型和一个连接标准。
If Di contains any join references, then look at each of these join objects and keep track of all attributes from both the left and right sides of these joins.
如果Di包含任何联结引用，那么要查看每个联结对象，记录这些联结左右两边的所有属性。
To find which side of the join Di is supposed to be on, look at the attributes for both the left and right sides of the join to see which side contains attributes for Di.
要想了解Di在联结的哪一边，可以查看联结左右的属性，看哪一边包含Di的属性。
To find which side of the join Di is supposed to be on, look at the attributes for both the left and right sides of the join to see which side contains attributes for Di.
要想了解Di在联结的哪一边，可以查看联结左右的属性，看哪一边包含Di的属性。
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