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https://issues.apache.org/jira/browse/LUCENE-7707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simon Willnauer resolved LUCENE-7707.
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Resolution: Fixed
Assignee: Simon Willnauer
thanks everbody! it's good to be back here :)
> Only assign ScoreDoc#shardIndex if it was already assigned to non default
> (-1) value
> ------------------------------------------------------------------------------------
>
> Key: LUCENE-7707
> URL: https://issues.apache.org/jira/browse/LUCENE-7707
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Fix For: master (7.0), 6.5.0
>
> Attachments: LUCENE-7707.patch, LUCENE-7707.patch, LUCENE-7707.patch,
> LUCENE-7707.patch, LUCENE-7707.patch, LUCENE-7707.patch
>
>
> When you use TopDocs.merge today it always overrides the ScoreDoc#shardIndex
> value. The assumption that is made here is that all shard results are merges
> at once which is not necessarily the case. If for instance incremental merge
> phases are applied the shard index doesn't correspond to the index in the
> outer TopDocs array. To make this a backwards compatible but yet
> non-controversial change we could change the internals of TopDocs#merge to
> only assign this value unless it's not been assigned before to a non-default
> (-1) value to allow multiple or sparse top docs merging.
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