Table of Contents

Boolean queries

BooleanQuery combines clauses using Occur:

  • Must — required.
  • Should — optional. Increases relevance.
  • MustNot — exclude.

Direct construction

using Rowles.LeanLucene.Search;
using Rowles.LeanLucene.Search.Queries;

var query = new BooleanQuery();
query.Add(new TermQuery("title", "fox"),  Occur.Must);
query.Add(new TermQuery("title", "quick"), Occur.Should);
query.Add(new TermQuery("title", "lazy"),  Occur.MustNot);

Fluent builder

var query = new BooleanQueryBuilder()
    .Must(new TermQuery("title", "fox"))
    .Should(new TermQuery("title", "quick"))
    .MustNot(new TermQuery("title", "lazy"))
    .Build();

Pure-filter mode

A BooleanQuery containing only MustNot clauses matches everything that satisfies the exclusions. Wrap in ConstantScoreQuery to skip BM25 when scoring is irrelevant.

See also

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