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https://issues.apache.org/jira/browse/LUCENE-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027578#comment-13027578
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Simon Willnauer commented on LUCENE-3056:
-----------------------------------------
Hey chris,
here are some comments:
* I like that you only have to change BooleanQuery to enable this!! nice!
* Can we rename RewriteState into RewriteContext its just more consistent to
all the other ctx we pass to query and scorer?
* Can we rename DefaultRewriteState into CachingRewriteContext and make a
RewriteContext that simply does query.rewrite() that way nothing changes by
default and we can use a static instance in Query#rewrite(IndexReader) maybe as
an anonymous inner class in Query?
* Can we move CachingRewriteContext into lucene/src/java/org/apache/lucene/util?
This change somewhat depends on LUCENE-3041 since we might wanna pass that
RewriteContext on a per segment level right? So maybe we should link those
issues.
> 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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