该访问计划假设，生成按prod _ id排序的数据流的排序操作被推至(push down)到两个数据源。
The access plan assumes that the sort operations to generate the data streams ordered on prod_id are pushed down to the two data sources.
测试计划会支持和测试相关环境(浏览器，数据库，操作系统以及其他的项目)，并使用它们来生成测试配置并追踪覆盖面。
Associate environments (browsers, databases, operating systems, and other items) that are supported and tested by the test plan and use those to generate test configurations and track coverage.
如果不采用异步方式，则访问计划中的 SHIP 操作符顺序地执行，分别访问对应的昵称并生成排序后的数据流。
Without asynchrony, the SHIP operators in the plan execute sequentially to access the respective nicknames and to generate sorted streams of data.
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