CBLQueryDataSource
@interface CBLQueryDataSource : NSObjectA query data source. used for specifiying the data source for your query. The current data source supported is the database.
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                  Create a database data source. DeclarationObjective-C + (nonnull instancetype)database:(nonnull CBLDatabase *)database;ParametersdatabaseThe database used as the data source as the query. Return ValueThe CBLQueryDatabase instance. 
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                  Create a database data source with the given alias name. DeclarationObjective-C + (nonnull instancetype)database:(nonnull CBLDatabase *)database as:(nullable NSString *)alias;ParametersdatabaseThe database used as the data source as the query. @alias The alias name of the data source. Return ValueThe CBLQueryDatabase instance. 
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                  Not available. DeclarationObjective-C - (nonnull instancetype)init;
 CBLQueryDataSource Class Reference
        CBLQueryDataSource Class Reference