Unfortunately, D is not available if the upper branch executes.
不幸的是，在上面的那个分支执行时，D是不可用的。
The upper branch leads to a fork that causes Task 1 and Task 2 to execute in parallel.
上面的分支通向一个fork，后者可以使Task1和Task2并列执行。
Because XML columns cannot participate in Group By clauses, you need to define a second XML Relational Mapping operator (shown on the upper branch of Figure 1).
因为xml列不能参与groupBy子句，所以需要定义第二个XMLRelationalMapping操作符(图1中上方的分支)。
Task 4 has an input criterion requiring only business items A and B for the upper branch, while for the lower branch it has a separate criterion that includes business items A, B, and D.
Task4有一个输入条件，只需将业务项A和B 提供给上面的分支，而它针对下面分支的则是一个单独的条件，其中包含业务项 A、B 和D。
Task 4 has an input criterion requiring only business items A and B for the upper branch, while for the lower branch it has a separate criterion that includes business items A, B, and D.
Task4有一个输入条件，只需将业务项A和B 提供给上面的分支，而它针对下面分支的则是一个单独的条件，其中包含业务项 A、B 和D。
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