Every WHERE id = N query flows through codegen_select_full_scan(), which emits linear walks through every row via Rewind / Next / Ne to compare each rowid against the target. At 100 rows with 100 lookups, that is 10,000 row comparisons instead of roughly 700 B-tree steps. O(n²) instead of O(n log n). This is consistent with the ~20,000x result in this run.
李田原表示,实现这些亮眼数据依靠两项非常特别的工程设计。
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이란 “최고지도자로 모즈타바 선출”…美와 화해 멀어졌다,更多细节参见谷歌
生产标准是品质的航标。以全产业链布局为根基,飞鹤在“鲜活”营养标准方面完成第二次产业升级。2018年,飞鹤携手中国标准化研究院,建立以“新鲜生牛乳一次成粉”技术为中心的奶粉生产标准,以可量化标准推动行业技术升级,锁住生牛乳的原生营养。