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https://issues.apache.org/jira/browse/LUCENE-6165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-6165:
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    Attachment: LUCENE-6165.patch

patch. all tests pass.

> Change merging APIs to work on CodecReader instead of LeafReader
> ----------------------------------------------------------------
>
>                 Key: LUCENE-6165
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6165
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>         Attachments: LUCENE-6165.patch
>
>
> Patch factors out "reader based on codec apis" and changes all merge 
> policy/addIndexes apis to use this. 
> If you want to do slow wrapping, you can still do it, just use 
> SlowCodecReaderWrapper.wrap(LeafReader) yourself (versus SegmentMerger doing 
> it always if its not a SegmentReader).
> Also adds FilterCodecReader, to make it easier to start efficiently filtering 
> on merge. I cutover all the index splitters to this. This means they should 
> be much much faster with this patch, they just change the deletes as you 
> expect, and the merge is as optimal as a normal one.
> In other places, for now I think we should just do a rote conversion with 
> SlowCodecReaderWrapper.wrap. Its no slower than today, just explicit, and we 
> can incrementally fix them to do the right thing in the future rather than 
> all at once.



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