Timothy Allison created LUCENE-4880:
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Summary: 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: 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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