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Posted to issues@lucene.apache.org by "Julie Tibshirani (Jira)" <ji...@apache.org> on 2021/01/27 18:15:02 UTC
[jira] [Commented] (LUCENE-7282) search APIs should take advantage
of index sort by default
[ https://issues.apache.org/jira/browse/LUCENE-7282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273067#comment-17273067 ]
Julie Tibshirani commented on LUCENE-7282:
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Sorry [~atris] I missed this (didn't have emails set up correctly!) We indeed added a new query to sandbox {{IndexSortSortedNumericDocValuesRangeQuery}} that optimize this case for range queries on numeric doc values. Since exact queries on numerics are usually modelled as range queries on [value, value], this would apply to exact queries as well (although I don't think we explicitly detect that case, so we may end up doing extra work). I agree it'd be great to explore other ways to leverage the index sort in queries.
> search APIs should take advantage of index sort by default
> ----------------------------------------------------------
>
> Key: LUCENE-7282
> URL: https://issues.apache.org/jira/browse/LUCENE-7282
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Priority: Major
>
> Spinoff from LUCENE-6766, where we made it very easy to have Lucene sort documents in the index (at merge time).
> An index-time sort is powerful because if you then search that index by the same sort (or by a "prefix" of it), you can early-terminate per segment once you've collected enough hits. But doing this by default would mean accepting an approximate hit count, and could not be used in cases that need to see every hit, e.g. if you are also faceting.
> Separately, `TermQuery` on the leading sort field can be very fast since we can advance to the first docID, and only match to the last docID for the requested value. This would not be approximate, and should be lower risk / easier.
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