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A methodology recently proposed to improve processing of star queries on data warehouses is the clustering and indexing of fact tables using their multidimensional hierarchies [DRSN98, MRB99, KS01]. Due to this improved organization schema, processing of aggregation star queries changes dramatically creating new optimization opportunities. An important optimization technique is the so-called pre-grouping transformation. Although this transformation is expected to improve the query-processingdblp:conf/dmdw/TsoisKST02 fatcat:avfxnetmfrhzzfiubf7dpjjs7y