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[improvement](agg) iterate aggregation data in memory written order (a…
…pache#12704) Following the iteration order of the hash table will result in out-of-order access to aggregate states, which is very inefficient. Traversing aggregate states in memory write order can significantly improve memory read efficiency. Test hash table items count: 3.35M Before this optimization: insert keys into column takes 500ms With this optimization only takes 80ms
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