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https://issues.apache.org/jira/browse/LUCENE-7568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15687599#comment-15687599
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ASF subversion and git services commented on LUCENE-7568:
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Commit 21735161dcbdfcad52220d0389637c43f0d7989d in lucene-solr's branch
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=2173516 ]
LUCENE-7568: Optimize merging when index sorting is used but the index is
already sorted
> 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: Ferenczi Jim
> 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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