向量检索的粒度是个两难：块太小匹配得准但上下文残缺，块太大上下文完整但语义被稀释。父子检索（small-to-big）用「小块检索、大块生成」把两个诉求拆开——索引里存的是子块，命中后回父块。本文讲清它的原理、三种常见形态、最小实现与工程取舍。

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