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https://issues.apache.org/jira/browse/LUCENE-7568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15687527#comment-15687527
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Michael McCandless commented on LUCENE-7568:
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Thanks [~jim.ferenczi], nice test refactoring! The patch looks great ... I'll
push shortly.
> 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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