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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4562) Pair-wise FST key comparator by ords
Date Sun, 18 Nov 2012 19:56:57 GMT
David Smiley created LUCENE-4562:
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             Summary: Pair-wise FST key comparator by ords
                 Key: LUCENE-4562
                 URL: https://issues.apache.org/jira/browse/LUCENE-4562
             Project: Lucene - Core
          Issue Type: New Feature
          Components: core/FSTs
            Reporter: David Smiley
            Priority: Minor


It would be useful to have an FST utility method to do a compare() operation between a key
in one FST and a key in a second FST, by ords instead of the keys.  So the input is the ord
for FST1 and an ord for FST2 and the output is -1, 0, 1.  The result is the same as if you
were to do a Util.getByOutput for both ords against their respective FSTs then compare the
resulting byte arrays.

The point of this is to speedup LUCENE-3729 further, which impact sorting across segments.
 I would be surprised if it doesn't have applicability to other problems.

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