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https://issues.apache.org/jira/browse/LUCENE-6365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14482044#comment-14482044
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Michael McCandless commented on LUCENE-6365:
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I like this change overall ... it means you can iterate over many more finite
strings if you want. I think a dedicated iterator is OK; just mark it
@lucene.experimental so we are free to improve it later.
bq. Iteration order changed, so when iterating with a limit, the result may
differ slightly.
I think that's fine and it's an impl detail (which strings you'll get when you
hit the limit) ... can you update the javadocs to say so?
> Optimized iteration of finite strings
> -------------------------------------
>
> Key: LUCENE-6365
> URL: https://issues.apache.org/jira/browse/LUCENE-6365
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/other
> Affects Versions: 5.0
> Reporter: Markus Heiden
> Priority: Minor
> Labels: patch, performance
> Attachments: FiniteStringsIterator.patch
>
>
> Replaced Operations.getFiniteStrings() by an optimized FiniteStringIterator.
> Benefits:
> Avoid huge hash set of finite strings.
> Avoid massive object/array creation during processing.
> "Downside":
> Iteration order changed, so when iterating with a limit, the result may
> differ slightly. Old: emit current node, if accept / recurse. New: recurse /
> emit current node, if accept.
> The old method Operations.getFiniteStrings() still exists, because it eases
> the tests. It is now implemented by use of the new FiniteStringIterator.
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