（原文由长青研究社提供，钛媒体获准转载）
Because candidates produced by the text search index may not be in contiguous order, columnar arrays must have true O(1) random access. In Tantivy’s columnar format, this is achieved by setting the row ID of a columnar value to its ordinal (i.e. its position in the array). So accessing a value from a column to evaluate a filter is simply:
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于是，两大头部品牌的低价厮杀，直接将咖啡价格拉至历史低位，也倒逼幸运咖、挪瓦咖啡等中小品牌纷纷跟进，形成“无9.9元不咖啡”的行业怪象。
Изображение: Igor Jakubowski / Globallookpress.com