[jira] [Commented] (LUCENE-8484) Allow SubReaderWrapper to filter out entire readers

["Adrien Grand (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-8484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603079#comment-16603079 ] 

Adrien Grand commented on LUCENE-8484:
--------------------------------------

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?

> 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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