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From "Michael McCandless (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4562) Pair-wise FST key comparator by ords
Date Mon, 19 Nov 2012 00:22:58 GMT


Michael McCandless commented on LUCENE-4562:

That's a cool idea!  In the patch in LUCENE-3729 I just do the full lookup and then compare
... but making it incremental (this issue) is a great idea.
> Pair-wise FST key comparator by ords
> ------------------------------------
>                 Key: LUCENE-4562
>                 URL:
>             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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