When the asynchrony feature of WFS 9.1 is enabled by setting the appropriate configuration parameters, the query execution plan for the UNION ALL query illustrated above may look like this.
当通过设置适当的配置参数启用WFS 9.1中的异步特性时，前面演示的UNION ALL查询的查询执行计划如下。
Configuration rules are objects too, which composite compound rules by "Union", "Intersection" and "Supplement" logic relationships.
配置规则也被存储为对象并通过“与”、“或”、“非”的逻辑组合形成复合规则。
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