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https://issues.apache.org/jira/browse/LUCENE-4198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16342865#comment-16342865
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Robert Muir commented on LUCENE-4198:
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Sorry, took me a long time (been traveling). I think the work is impressive and
clean, but just have a few thoughts, maybe for the future: it would be nice if
we didn't have to pass SimScorer down to this low level.
I guess I am suggesting we could explore an even lower-level API for
impactsenum where the consumer (likely gonna be org.apache.lucene.search) is
the only one aware of the scoring function, so the codec api is really exposing
raw data instead. I feel like this would map better to how the other codec apis
work, give a bit better separation?
That being said, I think its more important to make progress for now... the api
is labelled experimental so we could improve it in the future. Its also not
stupid-complicated or anything, just two methods! Also admittedly, I don't have
any real solid use cases for the "rawer" api besides CheckIndex, maybe
searchAfter..., its just more of a stretch idea.
> Allow codecs to index term impacts
> ----------------------------------
>
> Key: LUCENE-4198
> URL: https://issues.apache.org/jira/browse/LUCENE-4198
> Project: Lucene - Core
> Issue Type: Sub-task
> Components: core/index
> Reporter: Robert Muir
> Priority: Major
> Attachments: LUCENE-4198-BMW.patch, LUCENE-4198.patch,
> LUCENE-4198.patch, LUCENE-4198.patch, LUCENE-4198.patch, LUCENE-4198.patch,
> LUCENE-4198_flush.patch
>
>
> Subtask of LUCENE-4100.
> Thats an example of something similar to impact indexing (though, his
> implementation currently stores a max for the entire term, the problem is the
> same).
> We can imagine other similar algorithms too: I think the codec API should be
> able to support these.
> Currently it really doesnt: Stefan worked around the problem by providing a
> tool to 'rewrite' your index, he passes the IndexReader and Similarity to it.
> But it would be better if we fixed the codec API.
> One problem is that the Postings writer needs to have access to the
> Similarity. Another problem is that it needs access to the term and
> collection statistics up front, rather than after the fact.
> This might have some cost (hopefully minimal), so I'm thinking to experiment
> in a branch with these changes and see if we can make it work well.
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