该模块具备了RFC 3376所规范的绝大多数特性,特别是对源过滤(Source Filtering)的支持,并通过了完整的功能测试。IGMP模块的实现将有助于在ns2平台上深入开展有关组播技术的研究。
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最后，我们还需要确定整体数据访问策略——先检索什么数据，如何在每个源上过滤数据等。
And finally, we needed to determine our overall data access strategy — which data to retrieve first, how we would filter data at each source, etc.
基本设计思想是，从video4linu x源开始，将其过滤为rgb，然后将它的一个副本发送到屏幕，另一个发送到可以临时保存JPEG文件的图像接收器。
The basic design is to start with the video4linux source, filter it into RGB, and then send one copy to the screen and one to an image sink that can occasionally save JPEGs.
从概念上说，merge函数通过应用on子句过滤，将源表行与目标表行进行联接，所有联接的行都在目标中进行更新或者删除。
Conceptually, the merge function joins source table rows with target table rows by applying the on clause filter. All the joined rows are updated or deleted on the target.
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