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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2668) offset gap should be added regardless of existence of tokens in DocInverterPerField
Date Fri, 01 Oct 2010 18:44:33 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916997#action_12916997
] 

David Smiley commented on LUCENE-2668:
--------------------------------------

Apologies; I meant to post to LUCENE-2529

> offset gap should be added regardless of existence of tokens in DocInverterPerField
> -----------------------------------------------------------------------------------
>
>                 Key: LUCENE-2668
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2668
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.9.3, 3.0.2, 3.1, 4.0
>            Reporter: Koji Sekiguchi
>            Assignee: Koji Sekiguchi
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2668.patch, LUCENE-2668.patch, LUCENE-2668.patch, Test.java
>
>
> Problem: If a multiValued field which contains a stop word (e.g. "will" in the following
sample) only value is analyzed by StopAnalyzer when indexing, the offsets of the subsequent
tokens are not correct.
> {code:title=indexing a multiValued field}
> doc.add( new Field( F, "Mike", Store.YES, Index.ANALYZED, TermVector.WITH_OFFSETS ) );
> doc.add( new Field( F, "will", Store.YES, Index.ANALYZED, TermVector.WITH_OFFSETS ) );
> doc.add( new Field( F, "use", Store.YES, Index.ANALYZED, TermVector.WITH_OFFSETS ) );
> doc.add( new Field( F, "Lucene", Store.YES, Index.ANALYZED, TermVector.WITH_OFFSETS )
);
> {code}
> In this program (soon to be attached), if you use WhitespaceAnalyzer, you'll get the
offset(start,end) for "use" and "Lucene" will be use(10,13) and Lucene(14,20). But if you
use StopAnalyzer, the offsets will be use(9,12) and lucene(13,19). When searching, since searcher
cannot know what analyzer was used at indexing time, this problem causes out of alignment
of FVH.
> Cause of the problem: StopAnalyzer filters out "will", anyToken flag set to false then
offset gap is not added in DocInverterPerField:
> {code:title=DocInverterPerField.java}
> if (anyToken)
>   fieldState.offset += docState.analyzer.getOffsetGap(field);
> {code}
> I don't understand why the condition is there... If always the gap is added, I think
things are simple.

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