Major Description
Currently in a scan workload which scans 280 columns I see DeltaMemStore iteration taking up a significant amount of CPU in the scan, despite the fact that the dataset has no updates. Of 1.6sec in MaterializingIterator::NextBlock, we spent 0.61s in DMSIterator::PrepareBatch and 0.14s in DMSIterator::MayHaveDeltas. So, about 46% of our time here is on wasted work.