Optimize BytesRef comparator to use Unsafe long based comparison (when possible)
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Key: LUCENE-3654
URL: https://issues.apache.org/jira/browse/LUCENE-3654
Project: Lucene - Java
Issue Type: Improvement
Components: core/index, core/search
Reporter: Shay Banon
Inspire by Google Guava UnsignedBytes lexi comparator, that uses unsafe to do
long based comparisons over the bytes instead of one by one (which yields 2-4x
better perf), use similar logic in BytesRef comparator. The code was adapted to
support offset/length.
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