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https://issues.apache.org/jira/browse/LUCENE-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13744879#comment-13744879
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Michael McCandless commented on LUCENE-3849:
--------------------------------------------
I think because facet module cutover from payloads to DV, many of the
problematic TokenStreams disappeared? But there was still one, inside
DirectoryTaxonomyWriter, that I fixed in the patch ... it now calls
clearAttributes and sets each att on incrementToken.
That's a good idea on end(); I'll do that and check all impls.
I don't see a better way than setting posInc to 0 in end ... and I agree this
bug is bad. It can also affects suggesters, e.g. if it uses ShingleFilter
after StopFilter and the user's last word was a stop word.
> position increments should be implemented by TokenStream.end()
> --------------------------------------------------------------
>
> Key: LUCENE-3849
> URL: https://issues.apache.org/jira/browse/LUCENE-3849
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 3.6, 4.0-ALPHA
> Reporter: Robert Muir
> Attachments: LUCENE-3849.patch, LUCENE-3849.patch, LUCENE-3849.patch,
> LUCENE-3849.patch
>
>
> if you have pages of a book as multivalued fields, with the default position
> increment gap
> of analyzer.java (0), phrase queries won't work across pages if one ends with
> stopword(s).
> This is because the 'trailing holes' are not taken into account in end(). So
> I think in
> TokenStream.end(), subclasses of FilteringTokenFilter (e.g. stopfilter)
> should do:
> {code}
> super.end();
> posIncAtt += skippedPositions;
> {code}
> One problem is that these filters need to 'add' to the posinc, but currently
> nothing clears
> the attributes for end() [they are dirty, except offset which is set by the
> tokenizer].
> Also the indexer should be changed to pull posIncAtt from end().
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