[LUCENE-6889] BooleanQuery.rewrite could easily optimize some simple cases

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 5.5, 6.0
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Adrien Grand
• Created: 10/Nov/15 00:27
• Updated: 28/Aug/22 14:45
• Resolved: 03/Dec/15 15:45

Description

Follow-up of SOLR-8251: APIs and user interfaces sometimes encourage to write BooleanQuery instances that are not optimal, for instance a typical case that happens often with Solr/Elasticsearch is to send a request that has a MatchAllDocsQuery as a query and some filter, which could be executed more efficiently by directly wrapping the filter into a ConstantScoreQuery.

Here are some ideas of rewrite operations that BooleanQuery could perform:

• remove FILTER clauses when they are also a MUST clause
• rewrite queries of the form "+: #filter" to a ConstantScoreQuery(filter)
• rewrite to a MatchNoDocsQuery when a clause that is a MUST or FILTER clause is also a MUST_NOT clause

Issue Links

• duplicates: LUCENE-6787 BooleanQuery should be able to drop duplicate non-scoring clauses
• is related to: SOLR-8251 MatchAllDocsQuery is much slower in solr5.3.1 compare to solr4.7