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Posted to dev@lucene.apache.org by "David Smiley (JIRA)" <ji...@apache.org> on 2015/08/05 19:53:06 UTC
[jira] [Created] (SOLR-7878) Use SortedNumericDocValues (efficient
sort & facet on multi-valued numeric fields)
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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