MultiReader should not use PQ for its Term/sEnum if it has only 1 reader
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Key: LUCENE-2136
URL: https://issues.apache.org/jira/browse/LUCENE-2136
Project: Lucene - Java
Issue Type: Improvement
Components: Index
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 3.1
Related to LUCENE-2130....
Even though we've switched to segment-based searching, there are still times
when the Term/sEnum is used against the top-level reader. I think Solr does
this, and from LUCENE-2130, certain rewrite modes of MTQ will do this as well.
Currently, on an optimized index, MTQ is still using a PQ to present the terms,
which is silly because this just adds a sizable amount of overhead. In such
cases we should simply delecate to the single segment.
Note that the single segment can have deletions, and we should still delegate.
Ie, the index need not be optimized, just have a single segment.
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