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From "Robert Muir (JIRA)" <>
Subject [jira] Commented: (SOLR-1860) improve stopwords list handling
Date Sun, 25 Jul 2010 23:51:53 GMT


Robert Muir commented on SOLR-1860:

I'd still like to fix all this duplication between wordlistloader etc, but for now i will
add the snowball stop support and introduce examples that use the embedded stopwords in the
jar files.

And as discussed on SOLR-2015, if we are gonna lay down traps for other languages like autogenerating
phrase queries, then these should be in the main schema.xml, not tucked away.

> improve stopwords list handling
> -------------------------------
>                 Key: SOLR-1860
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: Schema and Analysis
>    Affects Versions: 3.1
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>            Priority: Minor
> Currently Solr makes it easy to use english stopwords for StopFilter or CommonGramsFilter.
> Recently in lucene, we added stopwords lists (mostly, but not all from snowball) to all
the language analyzers.
> So it would be nice if a user can easily specify that they want to use a french stopword
list, and use it for StopFilter or CommonGrams.
> The ones from snowball, are however formatted in a different manner than the others (although
in Lucene we have parsers to deal with this).
> Additionally, we abstract this from Lucene users by adding a static getDefaultStopSet
to all analyzers.
> There are two approaches, the first one I think I prefer the most, but I'm not sure it
matters as long as we have good examples (maybe a foreign language example schema?)
> 1. The user would specify something like:
>  <filter class="solr.StopFilterFactory" fromAnalyzer="org.apache.lucene.analysis.FrenchAnalyzer"
>  This would just grab the CharArraySet from the FrenchAnalyzer's getDefaultStopSet method,
who cares where it comes from or how its loaded.
> 2. We add support for snowball-formatted stopwords lists, and the user could something
> <filter class="solr.StopFilterFactory" words="org/apache/lucene/analysis/snowball/french_stop.txt"
format="snowball" ... />
> The disadvantage to this is they have to know where the list is, what format its in,
etc. For example: snowball doesn't provide Romanian or Turkish
> stopword lists to go along with their stemmers, so we had to add our own.
> Let me know what you guys think, and I will create a patch.

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