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https://issues.apache.org/jira/browse/LUCENE-4880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-4880:
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Attachment: LUCENE-4880.patch
Attached is a fix with tests.
> Difference in offset handling between IndexReader created by MemoryIndex and
> one created by RAMDirectory
> --------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-4880
> URL: https://issues.apache.org/jira/browse/LUCENE-4880
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.2
> Environment: Windows 7 (probably irrelevant)
> Reporter: Timothy Allison
> Attachments: LUCENE-4880.patch,
> MemoryIndexVsRamDirZeroLengthTermTest.java
>
>
> MemoryIndex skips tokens that have length == 0 when building the index; the
> result is that it does not increment the token offset (nor does it store the
> position offsets if that option is set) for tokens of length == 0. A regular
> index (via, say, RAMDirectory) does not appear to do this.
> When using the ICUFoldingFilter, it is possible to have a term of zero length
> (the \u0640 character separated by spaces). If that occurs in a document,
> the offsets returned at search time differ between the MemoryIndex and a
> regular index.
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