Support Query Rewriting Caching
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Key: LUCENE-3056
URL: https://issues.apache.org/jira/browse/LUCENE-3056
Project: Lucene - Java
Issue Type: Improvement
Reporter: Chris Male
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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