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https://issues.apache.org/jira/browse/LUCENE-1920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12757236#action_12757236
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Mark Miller commented on LUCENE-1920:
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An optimized index is a single segment - MultiReader reads from multiple
segments, and so I would argue its not optimized and should return false.
If InstantiatedIndex will work when all of the segments MultiReader refs are
optimized somehow, I believe the workaround belongs in InstantiatedIndex.
Counterpoints?
> Make MultiReader.isOptimized() return a useful result
> -----------------------------------------------------
>
> Key: LUCENE-1920
> URL: https://issues.apache.org/jira/browse/LUCENE-1920
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Bernd Fondermann
> Priority: Minor
> Attachments: MultiReader_isOptimized.patch
>
>
> The MultiReader statically returns FALSE on any isOptimized() call.
> This makes it unusable as the source index for an InstantiatedIndex, which
> checks initially if the source index is optimized and aborts if not.
> The attached patch iterates all sub readers and returns TRUE if all of them
> are optimized.
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