Goetz Graefe The Cascades Framework for Query Optimization. 19-29 1995 18 IEEE Data Eng. Bull. 3 DEBU/95SEP-CD.PDF db/journals/debu/debu18.html#Graefe95a db/journals/debu/Graefe95a.html conf/sigmod/BlakeleyMG93 conf/sigmod/GraefeD87 journals/csur/Graefe93 conf/icde/GraefeM93 conf/sigmod/Lohman88 conf/vldb/MitchellDZ93 conf/sigmod/SelingerACLP79 conf/vldb/WolniewiczG93