if (pending.length 0) yield [pending];
}struct Inventory {。关于这个话题，PG官网提供了深入分析
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While these ordering changes are almost always benign, if you’re comparing compiler outputs between runs (for example, checking emitted declaration files in 6.0 vs 7.0), these different orderings can produce a lot of noise that makes it difficult to assess correctness.
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