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https://issues.apache.org/jira/browse/SOLR-3017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13200029#comment-13200029
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Erick Erickson commented on SOLR-3017:
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Yeah, it's unclear to me what the "right thing" here is. I'm really a bit fuzzy
about whether ever setting this value to null is permissible or whether
preventing that is too draconian. I suppose that since we're going from hard
checking for StopFilterFactory, we can at least argue that either way it's not
likely to break existing code.
Please feel free to update the patch as you see fit, then we'll wait a couple
of days for anyone who looks to object and I'll check it in.
> Allow edismax stopword filter factory implementation to be specified
> --------------------------------------------------------------------
>
> Key: SOLR-3017
> URL: https://issues.apache.org/jira/browse/SOLR-3017
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.0
> Reporter: Michael Dodsworth
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-3017-without-guava-alternative.patch,
> SOLR-3017.patch, SOLR-3017.patch, edismax_stop_filter_factory.patch
>
>
> Currently, the edismax query parser assumes that stopword filtering is being
> done by StopFilter: the removal of the stop filter is performed by looking
> for an instance of 'StopFilterFactory' (hard-coded) within the associated
> field's analysis chain.
> We'd like to be able to use our own stop filters whilst keeping the edismax
> stopword removal goodness. The supplied patch allows the stopword filter
> factory class to be supplied as a param, "stopwordFilterClassName". If no
> value is given, the default (StopFilterFactory) is used.
> Another option I looked into was to extend StopFilterFactory to create our
> own filter. Unfortunately, StopFilterFactory's 'create' method returns
> StopFilter, not TokenStream. StopFilter is also final.
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