David Smiley created SOLR-7878:
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Summary: Use SortedNumericDocValues (efficient sort & facet on
multi-valued numeric fields)
Key: SOLR-7878
URL: https://issues.apache.org/jira/browse/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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