注册表的值又确定在查询优化期间将使用何种类型的刷新延迟物化查询表。
The value of the register in turn determines what types of refresh deferred materialized query tables will be used during query optimization.
当注册表调用查询与动态项关联的值时，会调用该函数以返回所需的一个或多个值。
When a Registry call queries values associated with a dynamic key, that function is called to return the desired value or values.
当注册表调用查询与动态项关联的值时，会调用该函数以返回所需的一个或多个值。
When a Registry call queries values associated with a dynamic key, that function is called to return the desired value or values.
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