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Posted to dev@lucene.apache.org by "James Dyer (JIRA)" <ji...@apache.org> on 2011/07/15 22:57:01 UTC
[jira] [Created] (LUCENE-3322) Disable cross-matches on
multi-valued fields
Disable cross-matches on multi-valued fields
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Key: LUCENE-3322
URL: https://issues.apache.org/jira/browse/LUCENE-3322
Project: Lucene - Java
Issue Type: Improvement
Components: core/search
Affects Versions: 4.0
Reporter: James Dyer
Priority: Minor
When searching against a multi-valued field it is often advantageous to disable cross-matches. For instance, if a book contains two authors: "john smith" and "brian jones", a search for "john jones" should not match.
Currently the best workaround is to search using a sloppy phrase query. The drawback is that phrases are incompatible with other features such as wildcards and ranges. Additionally, it is left up to the user to know to formulate the query differently if searching a multi-valued field.
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[jira] [Updated] (LUCENE-3322) Disable cross-matches on
multi-valued fields
Posted by "James Dyer (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/LUCENE-3322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
James Dyer updated LUCENE-3322:
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Attachment: LUCENE-3322.patch
Here is an initial patch. Creating this was an adventure for me in learning some of Lucene's internals!
In this approach, ConjunctionScorer verifies that all of the matches' positions fall within the range of a user-supplied positionIncrementGap. Supported query types are: TermQuery, TermRangeQuery, PrefixQuery, PhraseQuery, WidlcardQuery, FuzzyQuery & BooleanQuery. A unit test is included demonstrating use with each of these query types.
All unit tests pass. However, there are some glaring inefficiencies in this initial impl attempt. Perhaps LUCENE-2878 will ultimately provide much of the functionality otherwise implemented here (??). Also, should LUCENE-2308 be implemented, there might be an opportunity to store a Field Type's PositionIncrementGap in the index, further lessening the burden on the user to correctly issue these types of queries.
> Disable cross-matches on multi-valued fields
> --------------------------------------------
>
> Key: LUCENE-3322
> URL: https://issues.apache.org/jira/browse/LUCENE-3322
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 4.0
> Reporter: James Dyer
> Priority: Minor
> Attachments: LUCENE-3322.patch
>
>
> When searching against a multi-valued field it is often advantageous to disable cross-matches. For instance, if a book contains two authors: "john smith" and "brian jones", a search for "john jones" should not match.
> Currently the best workaround is to search using a sloppy phrase query. The drawback is that phrases are incompatible with other features such as wildcards and ranges. Additionally, it is left up to the user to know to formulate the query differently if searching a multi-valued field.
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