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https://issues.apache.org/jira/browse/LUCENE-1131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12628967#action_12628967
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Shai Erera commented on LUCENE-1131:
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What if we implement numDeletedDocs() in IndexReader, instead of defining it
abstract?
Those that extend IndexReader (outside the scope of the attached patch) can
then choose to override the implementation or not.
The purpose of the patch is to add an explicit method which developers can use,
rather than understand the logic on maxDoc() - numDocs(). Not all extended
classes implement it this way BTW. SegmentReader just calls
deletedDocs.count(), rather then calling the two separate methods.
> Add numDeletedDocs to IndexReader
> ---------------------------------
>
> Key: LUCENE-1131
> URL: https://issues.apache.org/jira/browse/LUCENE-1131
> Project: Lucene - Java
> Issue Type: New Feature
> Reporter: Shai Erera
> Assignee: Otis Gospodnetic
> Priority: Minor
> Fix For: 2.4
>
> Attachments: LUCENE-1131.patch
>
>
> Add numDeletedDocs to IndexReader. Basically, the implementation is as simple
> as doing:
> public int numDeletedDocs() {
> return deletedDocs == null ? 0 : deletedDocs.count();
> }
> in SegmentReader.
> Patch to follow to include in all IndexReader extensions.
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