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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2262) QueryParser should now allow leading '?' wildcards
Date Sun, 14 Feb 2010 03:22:27 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833496#action_12833496
] 

Robert Muir commented on LUCENE-2262:
-------------------------------------

bq. in my opinion disallowing these queries with leading wildcards, be it * or ? or whatever,
is rather silly, since we allow even slower fuzzyqueries by default.

bq. Agree.

What do you think, should we skip this step then and simply deprecate the entire setAllowLeadingWildcard
concept all together, setting it to true for Version >= 3.1?


> QueryParser should now allow leading '?' wildcards
> --------------------------------------------------
>
>                 Key: LUCENE-2262
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2262
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: QueryParser
>    Affects Versions: Flex Branch
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
>             Fix For: Flex Branch
>
>         Attachments: LUCENE-2262.patch, LUCENE-2262_backwards.patch
>
>
> QueryParser currently throws an exception if a wildcard term begins with the '?' operator.
> The current documentation describes why this is:
> {noformat}
> When set, * or ? are allowed as the first character of a PrefixQuery and WildcardQuery.
> Note that this can produce very slow queries on big indexes. 
> {noformat}
> In the flexible indexing branch, wildcard queries with leading '?' operator are no longer
slow on big indexes (they do not enumerate terms in linear fashion).
> Thus, it no longer makes sense to throw a ParseException for a leading '?'
> So, users should be able to perform a query of "?foo" and no longer get a ParseException
from the QueryParser.
> For the flexible indexing branch, wildcard queries of  'foo?', '?foo', 'f?oo', etc are
all the same from a performance perspective.

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