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https://issues.apache.org/jira/browse/SOLR-10046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924860#comment-15924860
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Keith Laban commented on SOLR-10046:
------------------------------------

I rebased with master and added in the new {{get*CacheHelper}} methods which 
were added in LUCENE-7410 although I think that the delegations I added should 
be in the abstract {{FilterCodecReader}} instead

> Create UninvertDocValuesMergePolicy
> -----------------------------------
>
>                 Key: SOLR-10046
>                 URL: https://issues.apache.org/jira/browse/SOLR-10046
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Keith Laban
>            Assignee: Christine Poerschke
>
> Create a merge policy that can detect schema changes and use 
> UninvertingReader to uninvert fields and write docvalues into merged segments 
> when a field has docvalues enabled.
> The current behavior is to write null values in the merged segment which can 
> lead to data integrity problems when sorting or faceting pending a full 
> reindex. 
> With this patch it would still be recommended to reindex when adding 
> docvalues for performance reasons, as it not guarenteed all segments will be 
> merged with docvalues turned on.



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