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Electronic commerce is emerging as a major application area for database systems. A large number of e-commerce stores provide electronic product catalogs that allow customers to search products of interest and store owners to manage various product information. Due to the constant schema evolution and the sparsity of e-commerce data, most commercial e-commerce systems use the so-called vertical schema for data storage. However, query processing for data stored using vertical schema is extremelydoi:10.1109/icebe.2005.82 dblp:conf/icebe/LimW05 fatcat:lrwjxxa6ufectlvlz4cql5krna