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In implementing preference-aware query processing, a straightforward option is to build a plug-in on top of the database engine. However, treating the DBMS as a black box affects both the expressivity and performance of queries with preferences. In this paper, we argue that preference-aware query processing needs to be pushed closer to the DBMS. We present a preference-aware relational data model that extends database tuples with preferences and an extended algebra that captures the essence ofdoi:10.1109/icde.2012.31 dblp:conf/icde/ArvanitisK12 fatcat:k6sxm62jkrgbdn2frxodmotiim