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https://issues.apache.org/jira/browse/LUCENE-7688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15872030#comment-15872030
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Keith Laban commented on LUCENE-7688:
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Hi Michael, the main use case is easily overaload the {{wrapForMerge}} function
in {{OneMerge}} without having write a whole merge policy. The required ticket
SOLR-10046 uses it to wrap the CodecReader with one that has access to
FeildCache and will add docvalues when merging segments if required. But
generally you can do anything you can do by wrapping a CodeReader, add/remove
fields, etc.
> add a OneMergeWrappingMergePolicy class
> ---------------------------------------
>
> Key: LUCENE-7688
> URL: https://issues.apache.org/jira/browse/LUCENE-7688
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Minor
> Attachments: LUCENE-7688.patch
>
>
> This ticket splits out the lucene part of the changes proposed in SOLR-10046
> for a conversation on whether or not the {{OneMergeWrappingMergePolicy}}
> class would best be located in Lucene or in Solr.
> (As an aside, the proposed use of
> [java.util.function.UnaryOperator|https://docs.oracle.com/javase/8/docs/api/java/util/function/UnaryOperator.html]
> causes {{ant documentation-lint}} to fail, I have created LUCENE-7689
> separately for that.)
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