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https://issues.apache.org/jira/browse/LUCENE-508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12556691#action_12556691
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Michael McCandless commented on LUCENE-508:
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I have a unit test showing this ... will commit fix shortly.
> SegmentTermEnum.next() doesn't maintain prevBuffer at end
> ---------------------------------------------------------
>
> Key: LUCENE-508
> URL: https://issues.apache.org/jira/browse/LUCENE-508
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 1.9, 2.0.0
> Environment: Lucene Trunk
> Reporter: Steven Tamm
> Assignee: Michael McCandless
> Priority: Minor
>
> When you're iterating a SegmentTermEnum and you go past the end of the docs,
> you end up with a state where the nextBuffer = null and the prevBuffer is the
> penultimate term, not the last term. This patch fixes it. (It's also
> required for my Prefetching bug [LUCENE-506])
> Index: java/org/apache/lucene/index/SegmentTermEnum.java
> ===================================================================
> --- java/org/apache/lucene/index/SegmentTermEnum.java (revision 382121)
> +++ java/org/apache/lucene/index/SegmentTermEnum.java (working copy)
> @@ -109,6 +109,7 @@
> /** Increments the enumeration to the next element. True if one exists.*/
> public final boolean next() throws IOException {
> if (position++ >= size - 1) {
> + prevBuffer.set(termBuffer);
> termBuffer.reset();
> return false;
> }
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