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https://issues.apache.org/jira/browse/LUCENE-2868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981706#action_12981706
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Simon Willnauer commented on LUCENE-2868:
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Actually, I think we need to clarify the description of this issue. This has
nothing todo with TermCache at all. It actually reads very scary though since
caches are really tricky and this one is mainly about rewrite cost in MTQ. This
said, adding a method to Query just for the sake of MTQ rewrite seems kind of
odd though. We should rather optimize the query structure somehow instead of
caching a rewrite method.
> It should be easy to make use of TermCache; 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
>
> 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 TermCache 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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