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Fixed the
lastaggregate to preserve null values, mirroring the behavior oflast_by_index. It is possible to generally implement null-awareness for all aggregate types, but many (sum) cannot producenulland the change is non-trivial, so this PR only applies this logic tolast. This change may slightly impact performance of this aggregate type in theory, but the benchmark suite does not show any perceivable regression.Fixes #1389