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https://issues.apache.org/jira/browse/LUCENE-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044929#comment-13044929
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KuroSaka TeruHiko commented on LUCENE-2645:
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Thank you, Michael, for quick fix, and David, for initially reporting this bug
and giving me a credit :-)
> False assertion of >0 position delta in StandardPostingsWriterImpl
> ------------------------------------------------------------------
>
> Key: LUCENE-2645
> URL: https://issues.apache.org/jira/browse/LUCENE-2645
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: David Smiley
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 4.0
>
> Attachments: LuceneTrunkAssertErrorReproducer.java
>
>
> StandardPostingsWriterImpl line 159 is:
> {code:java}
> assert delta > 0 || position == 0 || position == -1: "position=" +
> position + " lastPosition=" + lastPosition; // not quite right (if
> pos=0 is repeated twice we don't catch it)
> {code}
> I enable assertions when I run my unit tests and I've found this assertion to
> fail when delta is 0 which occurs when the same position value is sent in
> twice in arrow. Once I added RemoveDuplicatesTokenFilter, this problem went
> away. Should I really be forced to add this filter? I think delta >= 0
> would be a better assertion.
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