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https://issues.apache.org/jira/browse/LUCENE-1475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654518#action_12654518
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robert engels commented on LUCENE-1475:
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I think the API is wrong.
The method should either be
IndexReader[] getSubReaders()
It should return an empty array, not null when there are no sub readers.
But a better API is probably
IndexReader[] getReaders()
which contains an array containing itself if there are no sub-readers. The only
drawback to this is if we allow multiple levels, then you need to make a check
that this!=getReaders[0]
Using null adds null-checks in the common case.
> Expose sub-IndexReaders from MultiReader or MultiSegmentReader
> --------------------------------------------------------------
>
> Key: LUCENE-1475
> URL: https://issues.apache.org/jira/browse/LUCENE-1475
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.4
> Reporter: Jason Rutherglen
> Priority: Minor
> Attachments: LUCENE-1475.patch
>
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> MultiReader and MultiSegmentReader are package protected and do not expose
> the underlying sub-IndexReaders. A way to expose the sub-readers is to have
> an interface that an IndexReader may be cast to that exposes the underlying
> readers.
> This is for realtime indexing.
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