[jira] [Updated] (LUCENE-3056) Support Query Rewriting Caching

["Chris Male (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-3056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Male updated LUCENE-3056:
-------------------------------

    Attachment: LUCENE-3056.patch

Patch implementing what I outlined.  Converted BooleanQuery over to using RewriteState.

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