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Posted to dev@lucene.apache.org by GitBox <gi...@apache.org> on 2019/07/03 15:11:51 UTC
[GitHub] [lucene-solr] jpountz opened a new pull request #760: LUCENE-8311:
Phrase impacts
jpountz opened a new pull request #760: LUCENE-8311: Phrase impacts
URL: https://github.com/apache/lucene-solr/pull/760
This PR adds and leverages impacts for phrase queries. It contains two commits that are unrelated but getting them at the same time helps preserve performance: currently impacts don't specialize at all. After doing some digging, I noticed that one reason why the change made things slower is that postings specialize both the docs(+freqs) and docs+freqs+positions cases, while impacts don't specialize anything at all. So I removed the specialization for docs+freqs+positions with postings and added specialization for docs+freqs+positions with impacts instead. The assumption is that phrases are more often used for ranking than for filtering.
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