Hi,
I'm trying to reduce the re-computing of window aggregation. Here the AVG function for example. The original window aggregation's transition value(transValue) of AVG is an ArrayType, that contains two main values(sum, count). Now, I'm using a temporary transition value (tempTransValue), and I need to copy tempTransValue to the original window aggregation's transition value(transValue). I used the function datumCopy as following: peraggstate->transValue = datumCopy(peraggstate->tempTransValue, peraggstate->transtypeByVal, peraggstate->transtypeLen); But when the copied transValue is passed to the invoke function, here is int4_avg_accum, the ArrayType returned from PG_GETARG_ARRAYTYPE_P(0) is null. Which means the copy action is failed. Anybody know why? Or give me some suggestions? Thanks very much. Best Regards Chaoyong Wang
