Lucene - Combining multi field query with boolean query

Question

I am doing a free text search on my Lucene index using MultiFieldQueryParser on 2 fields, this works fine. Below is how I am building the search query:

var searchParser = new MultiFieldQueryParser(_currentLuceneVersion, new[] { _titleField, _bodyField }, _standardAnalyzer);
Query searchQuery = searchParser.Parse(searchText);

I have now added a new field, which is a boolean (1 or 0 as string), and I want my original search to do a boolean filter on the original free text search.

I am thinking that this must be done using a BooleanQuery and then doing a combine with the original MultiFieldQueryParser and the new BooleanQuery.

Is that right way to go about doing this?

You can also create a QueryFilter and give it to Search method — L.B
– L.B, Commented Feb 1, 2012 at 11:32
Like LB said i'd build 2 QueryFilters, one for 0 and one for 1. Then you keep them around and re-use them. You need to rebuild the Filters only when the index changes. QueryFilter caches the matching docs so you should see a performance increase over using a plain BooleanQuery clause — Jf Beaulac
– Jf Beaulac, Commented Feb 1, 2012 at 14:02

Jf Beaulac · Accepted Answer · 2012-02-01 14:16:02Z

1

Example of a QueryFilter for a 'false' value

QueryFilter falseFilter = new QueryFilter(new TermQuery(new Term("BOOL_FIELD", "0")));
searcher.search(query, falseFilter, maxResults);

answered Feb 1, 2012 at 14:16

Jf Beaulac

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2 Comments

jcvandan Over a year ago

can I just ask, is it possible to use multiple filters?

Jf Beaulac Over a year ago

yes, using the BooleanFilter in the Lucene.net contrib package, it is in the Lucene.Net.Search namespace

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