Qiming Chen Andy Therber Meichun Hsu Hans Zeller Bin Zhang Ren Wu Efficiently support MapReduce-like computation models inside parallel DBMS. 43-53 2009 IDEAS http://doi.acm.org/10.1145/1620432.1620438 conf/ideas/2009 db/conf/ideas/ideas2009.html#ChenTHZZW09