Reputation: 64854
I'm new to Lucene and I would like to know what's the difference (if there is any) between
PhraseQuery.add(Term1)
PhraseQuery.add(Term2)
PhraseQuery.add(Term3)
and
term1 = new TermQuery(new Term(...));
booleanQuery.add(term1, BooleanClause.Occur.SHOULD);
term2 = new TermQuery(new Term(...));
booleanQuery.add(term2, BooleanClause.Occur.SHOULD);
term3 = new TermQuery(new Term(...));
booleanQuery.add(term3, BooleanClause.Occur.SHOULD);
Upvotes: 3
Views: 2173
Reputation: 61081
PhraseQuery
requires that all the terms exist in the field being searched.BooleanQuery
does not require that all the terms exist.This leads to the question of what is the difference between your PhraseQuery
and:
term1 = new TermQuery(new Term(...));
booleanQuery.add(term1, BooleanClause.Occur.MUST);
term2 = new TermQuery(new Term(...));
booleanQuery.add(term2, BooleanClause.Occur.MUST);
term3 = new TermQuery(new Term(...));
booleanQuery.add(term3, BooleanClause.Occur.MUST);
The difference here is that the PhraseQuery
would require the terms be in the correct order, as opposed to the BooleanQuery
which would not have any particular order requirement.
Upvotes: 3