egg是一个全文检索引擎库（C语言实现），支持文档多域索引并提供高效的修改和删除操作，支持布尔查询，相关度查询，范围查询等多种查询方式。提供C/S接口能进行远程访问并支持文档分片存储。内部索引B+树实现。倒排表采用分块链表，每个块都采用差值存储且VINT压缩；支持文档批量写入文件。支持2种相关性排序，一种是以tf和idf为权重的空间向量排序，一种是根据查询词的紧密程度排序。
demo演示和docbook http://121.41.21.128/query.php
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