Robert Muir created LUCENE-6165:
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Summary: 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
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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