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https://issues.apache.org/jira/browse/LUCENE-2198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12801457#action_12801457
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Yonik Seeley commented on LUCENE-2198:
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bq. Only in the case that having multiple boolean attributes in the same
stream, there is additional cost.
But that's exactly what I was talking about when I said "if we should "bundle"
this with other (future) binary flags". No, it doesn't look like we have any
others now, I was talking about if we were going to have any others in the
future.
I also don't understand the arguments about type safety. Token bundles
multiple attributes together w/o loss of type safety, right?
bq. If we have more than one boolean attribute in lucene in future, we can
extend DEFAULT_ATTRIBUTE_FACTORY to support this.
Hmm, ok - that was really my only concern - the number of clone() calls due to
increasing numbers of attributes.
> support protected words in Stemming TokenFilters
> ------------------------------------------------
>
> Key: LUCENE-2198
> URL: https://issues.apache.org/jira/browse/LUCENE-2198
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Affects Versions: 3.0
> Reporter: Robert Muir
> Priority: Minor
> Attachments: LUCENE-2198.patch, LUCENE-2198.patch
>
>
> This is from LUCENE-1515
> I propose that all stemming TokenFilters have an 'exclusion set' that
> bypasses any stemming for words in this set.
> Some stemming tokenfilters have this, some do not.
> This would be one way for Karl to implement his new swedish stemmer (as a
> text file of ignore words).
> Additionally, it would remove duplication between lucene and solr, as they
> reimplement snowballfilter since it does not have this functionality.
> Finally, I think this is a pretty common use case, where people want to
> ignore things like proper nouns in the stemming.
> As an alternative design I considered a case where we generalized this to
> CharArrayMap (and ignoring words would mean mapping them to themselves),
> which would also provide a mechanism to override the stemming algorithm. But
> I think this is too expert, could be its own filter, and the only example of
> this i can find is in the Dutch stemmer.
> So I think we should just provide ignore with CharArraySet, but if you feel
> otherwise please comment.
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