查询系统读取不同数据源的数据字典，通过模式管理器建立起集成模式。
Through the schema manager, the query system creates an integrated schema after reading the data dictionaries of the various data sources.
查询系统读取不同数据源的数据字典，通过模式管理器建立起集成模式。
Through the schema manager, the query system creates an integrated schema after reading the data dictionaries of the various data sources.
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