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https://issues.apache.org/jira/browse/LUCENE-2262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833488#action_12833488
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Robert Muir commented on LUCENE-2262:
-------------------------------------
btw Yonik, 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.
so another option would be to do away with this 'setAllowLeadingWildcard' stuff
alltogether, and if you want to disallow something, extend QueryParser yourself
and throw ParseException yourself. I would actually prefer this.
i do think we should provide back compat to duplicate the previous behavior,
its perfectly reasonable that someone would have special handling for these
leading wildcards (e.g. Solr does).
but this issue is simply about the fact that in flex branch, leading ? is now
fast, so there is no excuse to disallow it anymore, hence we should relax the
queryparser to only throw a fit on leading *
> 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 docs say this:
> {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 flex branch, this is no longer true. foo?, ?foo, f?oo, these are all
> the same from a performance perspective.
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