Rafi Ahmed Allison W. Lee Andrew Witkowski Dinesh Das Hong Su Mohamed Zaït Thierry Cruanes Cost-Based Query Transformation in Oracle. 1026-1036 2006 conf/vldb/2006 VLDB http://www.vldb.org/conf/2006/p1026-ahmed.pdf db/conf/vldb/vldb2006.html#AhmedLWDSZC06