[jira] [Created] (LUCENE-4854) DocTermsOrd getOrdTermsEnum() buggy, lookupTerm/termsEnum is slow

["Robert Muir (JIRA)" <ji...@apache.org>]

Robert Muir created LUCENE-4854:
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             Summary: DocTermsOrd getOrdTermsEnum() buggy, lookupTerm/termsEnum is slow 
                 Key: LUCENE-4854
                 URL: https://issues.apache.org/jira/browse/LUCENE-4854
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Robert Muir
             Fix For: 5.0, 4.3, 4.2.1


Investigating a test failure in grouping/ I found the current dv api needs help for DocTermsOrds (this facet+grouping collector uses seekExact(BytesRef) on the termsenum):
* termsenum.seekExact is slow because the default implementation calls lookupTerm, which is slow. but this thing already has an optimal termsenum it can just return directly (since LUCENE-4819)
* lookupTerm is slow because the default implementation binary-searches ordinal space, calling lookupOrd and comparing to the target. However, lookupOrd is slow for this thing (must binary-search ordinal space again, then next() at most index_interval times).
* its getOrdTermsEnum() method is buggy: doesn't position correctly on an initial next(). Nothing uses this today, but if we want to return this thing directly it needs to work: its just a trivial check contained within next()


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