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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2672) speed up automaton seeking in nextString
Date Mon, 27 Sep 2010 04:47:32 GMT
speed up automaton seeking in nextString
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                 Key: LUCENE-2672
                 URL: https://issues.apache.org/jira/browse/LUCENE-2672
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
            Reporter: Robert Muir
            Priority: Minor
             Fix For: 4.0


While testing, i found there are some queries (e.g. wildcard ?????????) that do quite a lot
of backtracking.

nextString doesn't handle this particularly well, when it walks the DFA, if it hits a dead-end
and needs to backtrack, it increments the bytes, and starts over completely.

alternatively it could save the path information in an int[], and backtrack() could return
a position to restart from, instead of just a boolean.


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