Query processing contains parsing of global query, binding of query variable, decomposition of query and rewriting of query.

查询处理包括全局查询语句解析、查询变量绑定、查询分解和查询重写。

youdao

In multidatabase, access to global view will be decomposed to several sub-operations to several LDB, and perhaps also need data schema translation and query processing.

在多库系统中，对全局视图的存取操作要分解为针对多个LDB的子操作，可能还要对数据模式及查询语言进行转换。

youdao