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https://issues.apache.org/jira/browse/SOLR-10046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926101#comment-15926101
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Christine Poerschke commented on SOLR-10046:
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Thanks Keith! Above commit is for master branch, for the backporting to
branch_6x some adjustments appear to be needed, I've made a start on
[jira/SOLR-10046-branch_6x|https://github.com/apache/lucene-solr/tree/jira/SOLR-10046-branch_6x]
working branch w.r.t. src changes but test changes still remain to be done; I
won't have more time for it today, hence sharing the working branch in case you
might have time today or this week.
> 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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