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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2669) NumericRangeQuery.NumericRangeTermsEnum sometimes seeks backwards
Date Sun, 26 Sep 2010 17:58:32 GMT
NumericRangeQuery.NumericRangeTermsEnum sometimes seeks backwards
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                 Key: LUCENE-2669
                 URL: https://issues.apache.org/jira/browse/LUCENE-2669
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Search
            Reporter: Michael McCandless
             Fix For: 3.1, 4.0


Subclasses of FilteredTermsEnum are "supposed to" seek forwards only (this gives better performance,
typically).

However, we don't check for this, so I added an assert to do that (while digging into testing
the SimpleText codec) and NumericRangeQuery trips the assert!

Other MTQs seem not to trip it.

I think I know what's happening -- say NRQ has term ranges a-c, e-f to seek to, but then while
it's .next()'ing through the first range, the first term after c is f.  At this point NRQ
sees the range a-c is done, and then tries to seek to term e which is before f.  Maybe NRQ's
accept method should detect this case (where you've accidentally .next()'d into or possibly
beyond the next one or more seek ranges)?

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