Question

我试图更改MultiFieldQueryParser的默认运算符：

fields = [...]
query = "hello stackoverflow"
clauses = [BooleanClause.Occur.SHOULD, BooleanClause.Occur.SHOULD, ...]

parser = MultiFieldQueryParser(Version.LUCENE_CURRENT, fields, analyzer)
parser.setDefaultOperator(QueryParserBase.AND_OPERATOR)
query = parser.parse(Version.LUCENE_CURRENT, query, fields, clauses, analyzer)

生成的查询是：

(FieldA:hello FieldA:stackoverflow) (FieldB:hello FieldB:stackoverflow)

如何在一个或多个可用字段（fieldA，fieldB）中获取AND查询以仅检索包含两个单词（hello和stackoverflow）的文档？

谢谢！ - PyLucene 4.8.0，Python 2.7 64位

Answer 1

那些带有大量参数的MultiFieldQueryParser.parse方法都是 static 。查询解析器实例以及您对它所做的任何事情都可能根本不存在，您所拥有的相当于：

query = MultiFieldQueryParser.parse(Version.LUCENE_CURRENT, query, fields, clauses, analyzer)

使用查询解析器的实例时，您想要的parse是the one that just takes a string。

fields = ["FieldA", "FieldB"]
query = "hello stackoverflow"

parser = MultiFieldQueryParser(Version.LUCENE_CURRENT, fields, analyzer)
parser.setDefaultOperator(QueryParserBase.AND_OPERATOR)
query = parser.parse(query)

Answer 2

searcher = IndexSearcher(reader)
analyzer = WhitespaceAnalyzer(Version.LATEST)
fields = ('a', 'b', 'c')
parser = MultiFieldQueryParser(fields, analyzer)
query = parser.parser(query)
results = searcher.search(query,10)

Lucene的MultiFieldQueryParser忽略了setDefaultOperator

2 个答案: