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Posted to dev@lucene.apache.org by "Michael McCandless (JIRA)" <ji...@apache.org> on 2013/08/17 16:45:48 UTC
[jira] [Updated] (LUCENE-3849) position increments should be
implemented by TokenStream.end()
[ https://issues.apache.org/jira/browse/LUCENE-3849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael McCandless updated LUCENE-3849:
---------------------------------------
Attachment: LUCENE-3849.patch
New patch, syncing up to trunk, and fixing various tokenizers that had bugs ... tests pass.
> 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
>
>
> 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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