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https://issues.apache.org/jira/browse/SOLR-2585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095540#comment-13095540
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James Dyer commented on SOLR-2585:
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As a clarification, the necessary change I mention to DirectSpellChecker is
included in this patch (this question came up recently on the user-list).
This change allows us to offer any term within the specified maximum edit
distance as a Suggestion, regardless of the original term's frequency in the
index.
> Context-Sensitive Spelling Suggestions & Collations
> ---------------------------------------------------
>
> Key: SOLR-2585
> URL: https://issues.apache.org/jira/browse/SOLR-2585
> Project: Solr
> Issue Type: Improvement
> Components: spellchecker
> Affects Versions: 4.0
> Reporter: James Dyer
> Priority: Minor
> Attachments: SOLR-2585.patch, SOLR-2585.patch
>
>
> Solr currently cannot offer what I'm calling here a "context-sensitive"
> spelling suggestion. That is, if a user enters one or more words that have
> docFrequency > 0, but nevertheless are misspelled, then no suggestions are
> offered. Currently, Solr will always consider a word "correctly spelled" if
> it is in the index and/or dictionary, regardless of context. This issue &
> patch add support for context-sensitive spelling suggestions.
> See SpellCheckCollatorTest.testContextSensitiveCollate() for a the typical
> use case for this functionality. This tests both using
> IndexBasedSepllChecker and DirectSolrSpellChecker.
> Two new Spelling Parameters were added:
> - spellcheck.alternativeTermCount - The count of suggestions to return for
> each query term existing in the index and/or dictionary. Presumably, users
> will want fewer suggestions for words with docFrequency>0. Also setting this
> value turns "on" context-sensitive spell suggestions.
> - spellcheck.maxResultsForSuggest - The maximum number of hits the request
> can return in order to both generate spelling suggestions and set the
> "correctlySpelled" element to "false". For example, if this is set to 5 and
> the user's query returns 5 or fewer results, the spellchecker will report
> "correctlySpelled=false" and also offer suggestions (and collations if
> requested). Setting this greater than zero is useful for creating
> "did-you-mean" suggestions for queries that return a low number of hits.
> I have also included a test using shards. See additions to
> DistributedSpellCheckComponentTest.
> In Lucene, SpellChecker.java can already support this functionality (by
> passing a null IndexReader and field-name). The DirectSpellChecker, however,
> needs a minor enhancement. This gives the option to allow DirectSpellChecker
> to return suggestions for all query terms regardless of frequency.
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