时序引擎对以下聚合计算算子进行了优化，实现了增量计算，显著提升了性能：corr, covar, first, last, max, med, min, percentile, quantile, std, var, sum, sum2, sum3, sum4, wavg, wsum, count, firstNot, ifirstNot, lastNot, ilastNot, imax, imin, nunique, prod, sem, mode, searchK。