| http://www.w3.org/ns/prov#value | - More on SUM, COUNT, COUNT_STAR ?????? In general, SUM, COUNT, and other aggregates implicitly work on the ???rst column rel1 = LOAD ???data1.txt??? as (x:int, y:int, z:int); rel2 = GROUP rel1 ALL; rel3 = FOREACH rel2 GENERATE SUM(rel1); These will be the same rel4 = FOREACH rel2 GENERATE SUM(rel1.x); rel5 = FOREACH rel2 GENERATE SUM(rel1.y); These won???t ?????? COUNT counts only non-?????null ???
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