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https://issues.apache.org/jira/browse/LUCENE-8484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603087#comment-16603087
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Simon Willnauer commented on LUCENE-8484:
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{quote}What happens when a segment gets removed, will there be a gap in the
leaves, ie. LeafReaderContext.docBase will be greater than
LeafReaderContext.docBase + LeafReaderContext.reader().maxDoc() of the previous
leave, or will it keep dense doc IDs?
{quote}
it will have dense docIDs. We basically do the same thing
[here|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/StandardDirectoryReader.java#L107]
> Allow SubReaderWrapper to filter out entire readers
> ---------------------------------------------------
>
> Key: LUCENE-8484
> URL: https://issues.apache.org/jira/browse/LUCENE-8484
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.5, master (8.0)
> Reporter: Simon Willnauer
> Priority: Minor
> Fix For: 7.5, master (8.0)
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Today we can only wrap readers in SubReaderWrapper but never filter them out
> entirely. This causes a invariant for soft-deletes that exposes fully
> deleted
> segments with SoftDeletesDirectoryReaderWrapper.
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