another thing to check beyond whether the correct documents are
matched is whether the correct score is returned. I'm not sure
actually how it works but I can imagine that a query for "red red
wine" would produce a higher score for documents having "red red wine"
than it would for documents having "red wine wine"
On Tue, Sep 19, 2023 at 2:37 AM YouPeng Yang <yypvsxf19870...@gmail.com> wrote:
>
> Hi All
>
> During my unemployment time ,the happiest thing is diving to study the
> Lucene Source Code ,thanks for all the work .
>
> About the BooleanQuery.I am encounterd by a question about the execution
> of BooleanQuery:although,BooleanQuery#rewrite has done some works to
> remove duplicate FILTER,SHOULD clauses.however still the same term query
> can been executed the several times.
>
> I copy the test code in the TestBooleanQuery to approve my assumption.
>
> Unit Test Code as follows:
>
>
>
> BooleanQuery.Builder qBuilder = new BooleanQuery.Builder();
>
> qBuilder = new BooleanQuery.Builder();
>
> qBuilder.add(new TermQuery(new Term("field", "b")), Occur.*FILTER*);
>
> qBuilder.add(new TermQuery(new Term("field", "a")), Occur.*SHOULD*);
>
> qBuilder.add(new TermQuery(new Term("field", "d")), Occur.*SHOULD*);
>
> BooleanQuery.Builder nestQuery = new BooleanQuery.Builder();
>
> nestQuery.add(new TermQuery(new Term("field", "b")), Occur.*FILTER*);
>
> nestQuery.add(new TermQuery(new Term("field", "a")), Occur.*SHOULD*);
>
> nestQuery.add(new TermQuery(new Term("field", "d")), Occur.*SHOULD*);
>
> qBuilder.add(nestQuery.build(),Occur.*SHOULD*);
>
> qBuilder.setMinimumNumberShouldMatch(1);
>
> BooleanQuery q = qBuilder.build();
>
> q = qBuilder.build();
>
> assertSameScoresWithoutFilters(searcher, q);
>
>
> In this test, the top boolean query(qBuilder) contains 4 clauses(3 simple
> term-query ,1 nested boolean query that contains the same 3 term-quey).
>
> The underlying execution is that the all the 6 term query were executed(see
> TermQuery.Termweight#getTermsEnum()).
>
> Apparently and theoretically, the executions can be merged to increase the
> time,right?.
>
>
> So,Is there any possible or necessary that Lucene merge the execution to
> optimize the query performance, even I know the optimization may be
> difficult.
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