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https://issues.apache.org/jira/browse/LUCENE-7141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212346#comment-15212346
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Dawid Weiss commented on LUCENE-7141:
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+1. This is something I was going to suggest.
> OfflineSorter shouldn't always forceMerge in the end
> ----------------------------------------------------
>
> Key: LUCENE-7141
> URL: https://issues.apache.org/jira/browse/LUCENE-7141
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Attachments: LUCENE-7141.patch
>
>
> Today it always does a final merge, to collapse all segments into a single
> segment.
> But typically the caller is going to re-iterate all values anyway, to go off
> and build an FST or a BKD tree or something, and so that final forceMerge is
> often not necessary and the merging can be done on the fly when the caller
> consumes the result.
> This is somewhat tricky to do ... I'd like to break it into steps, starting
> with fixing the {{ByteSequencesReader}} API to implement {{BytesRefIterator}}
> instead of its own {{read(BytesRefBuilder)}} method as a first step.
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