java - Apache Lucene createWeight() 用于通配符查询

Question

我正在使用 Apache Lucene 6.6.0，我正在尝试从搜索查询中提取术语。当前版本的代码如下所示:

Query parsedQuery = new AnalyzingQueryParser("", analyzer).parse(query);
Weight weight = parsedQuery.createWeight(searcher, false);
Set<Term> terms = new HashSet<>();
weight.extractTerms(terms);

它工作得很好，但最近我注意到它不支持使用通配符(即 * 符号)的查询。如果查询包含通配符，则会出现异常:

java.lang.UnsupportedOperationException: Query id:123*456 does not implement createWeight at org.apache.lucene.search.Query.createWeight(Query.java:66) at org.apache.lucene.search.IndexSearcher.createWeight(IndexSearcher.java:751) at org.apache.lucene.search.BooleanWeight.(BooleanWeight.java:60) at org.apache.lucene.search.BooleanQuery.createWeight(BooleanQuery.java:225)

那么有没有办法将 createWeight() 与通配符查询一起使用？或者也许还有另一种方法可以从查询中提取搜索词而无需 createWeight()？

Answer 1

长话短说，需要重写查询，例如如下:

final AnalyzingQueryParser analyzingQueryParser = new AnalyzingQueryParser("", analyzer);

// TODO: The rewrite method can be overridden.
// analyzingQueryParser.setMultiTermRewriteMethod(MultiTermQuery.CONSTANT_SCORE_BOOLEAN_REWRITE);

Query parsedQuery = analyzingQueryParser.parse(query);
// Here parsedQuery is an instance of the org.apache.lucene.search.WildcardQuery class.

parsedQuery = parsedQuery.rewrite(reader);
// Here parsedQuery is an instance of the org.apache.lucene.search.MultiTermQueryConstantScoreWrapper class.

final Weight weight = parsedQuery.createWeight(searcher, false);
final Set<Term> terms = new HashSet<>();
weight.extractTerms(terms);

请参阅主题:

• 纳 boolean :Lucene - Java Users - How to get the terms matching a WildCardQuery in Lucene 6.2?
• 邮件存档:How to get the terms matching a WildCardQuery in Lucene 6.2?

了解更多详情。

似乎提到的堆栈溢出问题是这个:How to get matches from a wildcard Query in Lucene 6.2 .