FieldComparator.TermOrdValComparator compares by value unnecessarily
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Key: LUCENE-2531
URL: https://issues.apache.org/jira/browse/LUCENE-2531
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Michael McCandless
Priority: Minor
Fix For: 3.1, 4.0
Digging on LUCENE-2504, I noticed that TermOrdValComparator's compareBottom
method falls back on compare-by-value when it needn't.
Specifically, if we know the current bottom ord "matches" the current segment,
we can skip the value comparison when the ords are the same (ie, return 0)
because the ords are exactly comparable.
This is hurting string sort perf especially for optimized indices (and also
unoptimized indices), and especially for highly redundant (not many unique
values) fields. This affects all releases >= 2.9.x, but trunk is likely more
severely affected since looking up a value is more costly.
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