近年来，外卖行业发展迅速，2025年市场规模接近1.8万亿元。过去一年，更多互联网巨头杀入外卖市场，再加上预制菜技术的普及，进一步倒逼外卖价格不断“跳水”。
梅威斯| AIDC算力电源拼图（图源/企业）
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“It’s different this time, which is obviously a bit of a cliché, but for now at least, this is being approached quite prudently,” said Persson.
Now Postgres faces a dilemma. It can use the B-tree index on timestamp to get rows in the right timestamp order, but it has no way to skip directly to “US” rows. It must walk the index one entry at a time, checking the country for each row and discarding most of them. In the worst case, this means walking the entire index. Or it can scan rows that match severity