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Date: Mon, 24 Oct 2011 14:09:32 +0000 (UTC)
From: "Robert Muir (Commented) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Commented] (LUCENE-3526) preflex codec returns wrong terms
 if you use an empty field name
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    [ https://issues.apache.org/jira/browse/LUCENE-3526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134083#comment-13134083 ] 

Robert Muir commented on LUCENE-3526:
-------------------------------------

There are more serious problems in 3.x here.

* if you create new Field("", ""), you get IllegalArgumentException from Field's ctor: "name and value cannot both be empty"
* But there are tons of other ways to index an empty term for the empty field (for example initially make it "garbage" then .setValue(""), or via tokenstream).
* If you do this, and you have assertions enabled, you will trip the same assert bug i fixed in trunk here.
* If you don't have assertions enabled, you will create a corrupt index:     test: terms, freq, prox...ERROR [term : docFreq=1 != num docs seen 0 + num docs deleted 0]

So we need to figure out what the semantics should be for 3.x. is Term("", "") allowed or not?
                
> preflex codec returns wrong terms if you use an empty field name
> ----------------------------------------------------------------
>
>                 Key: LUCENE-3526
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3526
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 4.0
>            Reporter: Robert Muir
>         Attachments: LUCENE-3526.patch, LUCENE-3526_test.patch, LUCENE-3526_test.patch, LUCENE-3526_test.patch, LUCENE-3526_test.patch
>
>
> spinoff from LUCENE-3473.
> I have a standalone test for this... the termsenum is returning a bogus extra empty-term (I assume it has no postings, i didnt try).
> This causes the checkindex test in LUCENE-3473 to fail, because there are 4 terms instead of 3. 

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