This operator calculated a list of top elements regarding a scoring function. Only if the top elements change, an output will be produced. Additionally, the object that triggered the new calculation is send to output
Outputschema is List<TUPLE>, TUPLE
Remark: Use [] or elementAt to access elements in List and in TUPLE
PARSER PQL #ADDQUERY out = TOPK({ k = 10, scoringfunction = 'price' }, ELEMENTWINDOW({ size = 5 }, bid ) ) out2 = MAP({ expressions = [ #LOOP i 0 upto 9 ['elementAt(topk[${i}],1)','top_${i+1}_auction'], ['elementAt(topk[0],2)','top_${i+1}_bidder'], ['elementAt(topk[0],4)','top_${i+1}_price'], #ENDLOOP, 'topk' ], ALLOWNULL = true, SUPPRESSERRORS = true }, out ) |