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From "Robert Muir (JIRA)" <>
Subject [jira] [Created] (LUCENE-4819) move Sorted[Set]DocValuesTermsEnum to codec
Date Sun, 10 Mar 2013 05:55:13 GMT
Robert Muir created LUCENE-4819:

             Summary: move Sorted[Set]DocValuesTermsEnum to codec
                 Key: LUCENE-4819
             Project: Lucene - Core
          Issue Type: Improvement
          Components: core/index
            Reporter: Robert Muir
             Fix For: 4.3

Currently a user can instantiate a SortedDocValuesTermsEnum(SortedDocValues). 

This is a generic termsenum, implementing all operations by lookupOrd().

I think instead this should be the default implementation, and we should have e.g. SortedDocValues.termsEnum()
that returns it (codec can implement something fancier).

For example the default codec implements lookupOrd as an FST binary search, which means next()
on this termsenum is much slower than it needs to be for the places where this enum is actually
used (segment merging, OrdinalMap used for faceting in SOLR-4490 and LUCENE-4795) 

So instead, it can override this method and use an FSTEnum, and these operations are significantly
faster (3x faster for me with a simple benchmark with 10M terms).

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