The resulting query plans are based on data, rather than heuristics, and are thus extremely efficient.
生成的查询计划基于数据，而不是推断，因此非常高效。
YQL is basically a query language based on SQL that lets you query and retrieve structured data from multiple services in a standard way.
YQL基本上就是一种基于SQL的查询语言，允许以标准的方式从多个服务中查询和检索结构化数据。
Statistical profiles are then generated based on the data in the query feedback warehouse.
然后，基于查询反馈仓库中的数据生成统计配置文件。
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