Use query-private scope instead of shared Term->TermInfo cache
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                 Key: LUCENE-2093
                 URL: https://issues.apache.org/jira/browse/LUCENE-2093
             Project: Lucene - Java
          Issue Type: Improvement
            Reporter: Michael McCandless
            Priority: Minor
             Fix For: 3.1


Spinoff of LUCENE-2075.

We currently use a shared terms cache so multiple resolves of the same term 
within execution of a single query save CPU.  But this ties up a good amount of 
long term RAM...

So, it might be better to instead create a "query private scope", where places 
in Lucene like the terms dict could store & retrieve results.  The scope would 
be private to each running query, and would be GCable as soon as the query 
completes.  Then we've have perfect within query hit rate...

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