improve termquery "pk lookup" performance
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Key: LUCENE-2829
URL: https://issues.apache.org/jira/browse/LUCENE-2829
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Robert Muir
For things that are like primary keys and don't exist in some segments (worst
case is primary/unique key that only exists in 1)
we do wasted seeks.
While LUCENE-2694 tries to solve some of this issue with TermState, I'm
concerned we could every backport that to 3.1 for example.
This is a simpler solution here just to solve this one problem in termquery...
we could just revert it in trunk when we resolve LUCENE-2694,
but I don't think we should leave things as they are in 3.x
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