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https://issues.apache.org/jira/browse/LUCENE-7568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855938#comment-15855938
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ASF subversion and git services commented on LUCENE-7568:
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Commit 568f130c501c9c04a40a27e7952699490f155759 in lucene-solr's branch
refs/heads/branch_6x from [~jim.ferenczi]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=568f130 ]
LUCENE-7568: Fix test that should never create segments with a single document.
> Optimize merge when index sorting is used but the index is already sorted
> -------------------------------------------------------------------------
>
> Key: LUCENE-7568
> URL: https://issues.apache.org/jira/browse/LUCENE-7568
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Jim Ferenczi
> Fix For: master (7.0), 6.4
>
> Attachments: LUCENE-7568.patch, LUCENE-7568.patch
>
>
> When the index sorting is defined a lot of optimizations are disabled during
> the merge. For instance the bulk merge of the compressing stored fields is
> disabled since documents are not merged sequentially. Though it can happen
> that index sorting is enabled but the index is already in sorted order (the
> sort field is not filled or filled with the same value for all documents). In
> such case we can detect that the sort is not needed and activate the merge
> optimization.
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