Robert Muir created LUCENE-4819:
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Summary: move Sorted[Set]DocValuesTermsEnum to codec
Key: LUCENE-4819
URL: https://issues.apache.org/jira/browse/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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