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From "David Smiley (JIRA)" <>
Subject [jira] [Created] (SOLR-7878) Use SortedNumericDocValues (efficient sort & facet on multi-valued numeric fields)
Date Wed, 05 Aug 2015 17:53:06 GMT
David Smiley created SOLR-7878:

             Summary: Use SortedNumericDocValues (efficient sort & facet on multi-valued
numeric fields)
                 Key: SOLR-7878
             Project: Solr
          Issue Type: Improvement
          Components: Facet Module
            Reporter: David Smiley

Lucene has a SortedNumericDocValues (i.e. multi-valued numeric DocValues), ever since late
in the 4x versions.  Solr's TrieField.createFields unfortunately still uses SortedSetDocValues
for the multi-valued case.  SortedNumericDocValues is more efficient than SortedSetDocValues;
for example there is no 'ordinal' mapping for sorting/faceting needed.  

Unfortunately, updating Solr here would be quite a bit of work, since there are backwards-compatibility
concerns, and faceting code would need a new code path implementation just for this.  Sorting
is relatively simple thanks to SortedNumericSortField, and today multi-valued sorting isn't
directly possible.

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