If you always add a function like this to install your handlers, you never have to worry about your handlers clobbering other parts of the event-handling system.
如果在安装处理程序时总是添加这个函数，那么就永远不必担心您的处理程序会破坏事件处理系统中的其他部分。
If you want to support other queries, add whatever logic you need to the fetch function.
如果您想支持其他查询，向fetch函数添加任何您需要的逻辑。
If you manually add a query output column to an aggregate function in either the Criteria or SQL pane, the query and View Designer does not automatically remove other output columns from the query.
如果在“条件”窗格或“SQL”窗格中手动向聚合函数添加查询输出列，则查询和视图设计器不能自动从查询中移除其他输出列。
If you manually add a query output column to an aggregate function in either the Criteria or SQL pane, the query and View Designer does not automatically remove other output columns from the query.
如果在“条件”窗格或“SQL”窗格中手动向聚合函数添加查询输出列，则查询和视图设计器不能自动从查询中移除其他输出列。
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