Lucene QueryParser 问题答案

【问题标题】：Lucene QueryParser issueLucene QueryParser 问题
【发布时间】：2012-06-22 11:22:12
【问题描述】：

有人可以解释为什么原始查询（以编程方式生成）中的 OR（左起第二个）在解析后的查询中变为 MUST 吗？如何防止这种情况发生？

Original Query: +matchAllDocs:true +( request_id:(00000000000000000000000000002796 OR 00000000000000000000000000002829) OR ( matchAllDocs:true AND ( request_id:(00000000000000000000000000002796) AND status_id:(1)) OR ( request_id:(00000000000000000000000000002829) AND status_id:(2))) AND (alltext:(internal) OR subject:(internal )^1.5))

Parsed Query: +matchAllDocs:true +((request_id:00000000000000000000000000002796 request_id:00000000000000000000000000002829) +(+matchAllDocs:true +(+request_id:00000000000000000000000000002796 +status_id:1) (+request_id:00000000000000000000000000002829 +status_id:2)) +(alltext:intern subject:intern^1.5))

谢谢

【问题讨论】：

标签： lucene query-parser

【解决方案1】：

因为 AND 击败 OR（运算顺序）：

(something) OR //left will be SHOULD
(
    matchAllDocs:true AND 
    (
        request_id:(00000000000000000000000000002796) AND status_id:(1)
    ) OR 
    (
         request_id:(00000000000000000000000000002829) AND status_id:(2)
    )
) **AND** // left will be MUST
(alltext:(internal) OR subject:(internal )^1.5)

解决方案是使用更多的括号，如下所示：

+matchAllDocs:true +((request_id:(00000000000000000000000000002796 OR 00000000000000000000000000002829) OR ( matchAllDocs:true AND ( request_id:(00000000000000000000000000002796) AND status_id:(1)) OR ( request_id:(00000000000000000000000000002829) AND status_id:(2)))) AND (alltext:(internal) OR subject:(internal )^1.5))

【讨论】：