https://i.ancii.com/lucene/
探索Lucene/Solr高性能的秘密
Java自带 PriorityQueue实现类lucene段合并,当需要自定义比较器的时候没有Lucene自实现的PriorityQueue好用.
//Special comparator for sorting hits according to computed relevance . public static final ScoreDocComparator R
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