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From "Chris Male (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-2868) It should be easy to make use of TermState; rewritten queries should be shared automatically
Date Fri, 22 Apr 2011 14:14:05 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13023224#comment-13023224
] 

Chris Male commented on LUCENE-2868:
------------------------------------

I've opened LUCENE-3041 to work on the suggestions made by Earwin.

> It should be easy to make use of TermState; rewritten queries should be shared automatically
> --------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2868
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2868
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Query/Scoring
>            Reporter: Karl Wright
>         Attachments: LUCENE-2868.patch, LUCENE-2868.patch, lucene-2868.patch, lucene-2868.patch,
query-rewriter.patch
>
>
> When you have the same query in a query hierarchy multiple times, tremendous savings
can now be had if the user knows enough to share the rewritten queries in the hierarchy, due
to the TermState addition.  But this is clumsy and requires a lot of coding by the user to
take advantage of.  Lucene should be smart enough to share the rewritten queries automatically.
> This can be most readily (and powerfully) done by introducing a new method to Query.java:
> Query rewriteUsingCache(IndexReader indexReader)
> ... and including a caching implementation right in Query.java which would then work
for all.  Of course, all callers would want to use this new method rather than the current
rewrite().

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