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Posted to dev@lucene.apache.org by "Grant Ingersoll (JIRA)" <ji...@apache.org> on 2010/08/09 17:25:17 UTC
[jira] Updated: (SOLR-2010) Improvements to SpellCheckComponent
Collate functionality
[ https://issues.apache.org/jira/browse/SOLR-2010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Grant Ingersoll updated SOLR-2010:
----------------------------------
Attachment: SOLR-2010.patch
Added license headers
> Improvements to SpellCheckComponent Collate functionality
> ---------------------------------------------------------
>
> Key: SOLR-2010
> URL: https://issues.apache.org/jira/browse/SOLR-2010
> Project: Solr
> Issue Type: New Feature
> Components: clients - java, spellchecker
> Affects Versions: 1.4.1
> Environment: Tested against trunk revision 966633
> Reporter: James Dyer
> Assignee: Grant Ingersoll
> Priority: Minor
> Attachments: SOLR-2010.patch, SOLR-2010.patch
>
>
> Improvements to SpellCheckComponent Collate functionality
> Our project requires a better Spell Check Collator. I'm contributing this as a patch to get suggestions for improvements and in case there is a broader need for these features.
> 1. Only return collations that are guaranteed to result in hits if re-queried (applying original fq params also). This is especially helpful when there is more than one correction per query. The 1.4 behavior does not verify that a particular combination will actually return hits.
> 2. Provide the option to get multiple collation suggestions
> 3. Provide extended collation results including the # of hits re-querying will return and a breakdown of each misspelled word and its correction.
> This patch is similar to what is described in SOLR-507 item #1. Also, this patch provides a viable workaround for the problem discussed in SOLR-1074. A dictionary could be created that combines the terms from the multiple fields. The collator then would prune out any spurious suggestions this would cause.
> This patch adds the following spellcheck parameters:
> 1. spellcheck.maxCollationTries - maximum # of collation possibilities to try before giving up. Lower values ensure better performance. Higher values may be necessary to find a collation that can return results. Default is 0, which maintains backwards-compatible behavior (do not check collations).
> 2. spellcheck.maxCollations - maximum # of collations to return. Default is 1, which maintains backwards-compatible behavior.
> 3. spellcheck.collateExtendedResult - if true, returns an expanded response format detailing collations found. default is false, which maintains backwards-compatible behavior. When true, output is like this (in context):
> <lst name="spellcheck">
> <lst name="suggestions">
> <lst name="hopq">
> <int name="numFound">94</int>
> <int name="startOffset">7</int>
> <int name="endOffset">11</int>
> <arr name="suggestion">
> <str>hope</str>
> <str>how</str>
> <str>hope</str>
> <str>chops</str>
> <str>hoped</str>
> etc
> </arr>
> <lst name="faill">
> <int name="numFound">100</int>
> <int name="startOffset">16</int>
> <int name="endOffset">21</int>
> <arr name="suggestion">
> <str>fall</str>
> <str>fails</str>
> <str>fail</str>
> <str>fill</str>
> <str>faith</str>
> <str>all</str>
> etc
> </arr>
> </lst>
> <lst name="collation">
> <str name="collationQuery">Title:(how AND fails)</str>
> <int name="hits">2</int>
> <lst name="misspellingsAndCorrections">
> <str name="hopq">how</str>
> <str name="faill">fails</str>
> </lst>
> </lst>
> <lst name="collation">
> <str name="collationQuery">Title:(hope AND faith)</str>
> <int name="hits">2</int>
> <lst name="misspellingsAndCorrections">
> <str name="hopq">hope</str>
> <str name="faill">faith</str>
> </lst>
> </lst>
> <lst name="collation">
> <str name="collationQuery">Title:(chops AND all)</str>
> <int name="hits">1</int>
> <lst name="misspellingsAndCorrections">
> <str name="hopq">chops</str>
> <str name="faill">all</str>
> </lst>
> </lst>
> </lst>
> </lst>
> In addition, SOLRJ is updated to include SpellCheckResponse.getCollatedResults(), which will return the expanded Collation format. getCollatedResult(), which returns a single String, is retained for backwards-compatibility. Other APIs were not changed but will still work provided that spellcheck.collateExtendedResult is false.
> This likely will not return valid results if using Shards. Rather, a more robust interaction with the index would be necessary than what exists in SpellCheckCollator.collate().
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