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https://issues.apache.org/jira/browse/LUCENE-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027592#comment-13027592
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Chris Male commented on LUCENE-3056:
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bq. This change somewhat depends on LUCENE-3041 since we might wanna pass that
RewriteContext on a per segment level right?
Yeah, thats very true. I'm wondering whether its best to rethink the
signatures of the #search methods in IS since we need to incorporate both this
and LUCENE-3041.
I'll upload a patch shortly addressing the other improvements.
> Support Query Rewriting Caching
> -------------------------------
>
> Key: LUCENE-3056
> URL: https://issues.apache.org/jira/browse/LUCENE-3056
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 4.0
> Reporter: Chris Male
> Fix For: 4.0
>
> Attachments: LUCENE-3056.patch
>
>
> Out of LUCENE-3041, its become apparent that using a Visitor / Walker isn't
> right for caching the rewrites of Querys. Although we still intend to
> introduce the Query / Walker for advanced query transformations, rewriting
> still serves a purpose for very specific implementation detail writing. As
> such, it can be very expensive. So I think we should introduce first class
> support for rewrite caching. I also feel the key is to make the caching as
> transparent as possible, to reduce the strain on Query implementors.
> The TermState idea gave me the idea of maybe making a RewriteState /
> RewriteCache / RewriteInterceptor, which would be consulted for rewritten
> Querys. It would then maintain an internal cache that it would check. If a
> value wasn't found, it'd then call Query#rewrite, and cache the result.
> By having this external rewrite source, people could 'pre' rewrite Querys if
> they were particularly expensive but also common.
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