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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4500) Loosen up DirectSpellChecker's minPrefix requirements
Date Mon, 22 Oct 2012 19:52:13 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481728#comment-13481728
] 

Robert Muir commented on LUCENE-4500:
-------------------------------------

yeah i think we should add an option to disable this heuristic. 

It was basically a perf/relevance thing (in general edits of 2, esp considering a transposition
is a single edit, along wotj minPrefix of 0 can yield surprisingly irrelevant stuff).

But if someone wants that... let them do it.
                
> Loosen up DirectSpellChecker's minPrefix requirements
> -----------------------------------------------------
>
>                 Key: LUCENE-4500
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4500
>             Project: Lucene - Core
>          Issue Type: Improvement
>    Affects Versions: 4.0
>            Reporter: Erik Hatcher
>            Priority: Minor
>
> DirectSpellChecker currently mandates a minPrefix of 1 when editDistance=2.  This prohibits
a query of "nusglasses" from matching the indexed "sunglasses" term.
> Granted, there can be performance issues with using a minPrefix of 0, but it's a risk
that a user should be allowed to take if needed.

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