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https://issues.apache.org/jira/browse/LUCENE-8138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350347#comment-16350347
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Robert Muir commented on LUCENE-8138:
-------------------------------------

Also because checkindex historically did a sequential pass on the data thru all 
docs (like merging), mergeInstance makes it much faster. For example the stored 
fields reader decompresses differently for this case.

> Check that dv producers return the same values with advanceExact
> ----------------------------------------------------------------
>
>                 Key: LUCENE-8138
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8138
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-8138.patch
>
>
> Follow-up of LUCENE-8117. I'd like to make CheckIndex verify that doc values 
> producers return the same values regardless of whether the iterator was moved 
> with nextDoc/advance or advanceExact.



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