[jira] [Created] (LUCENE-6668) Optimize SortedSet/SortedNumeric storage for the few unique sets use-case

["Adrien Grand (JIRA)" <ji...@apache.org>]

Adrien Grand created LUCENE-6668:
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             Summary: Optimize SortedSet/SortedNumeric storage for the few unique sets use-case
                 Key: LUCENE-6668
                 URL: https://issues.apache.org/jira/browse/LUCENE-6668
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
            Priority: Minor


Robert suggested this idea: if there are few unique sets of values, we could build a lookup table and then map each doc to an ord in this table, just like we already do for table compression for numerics.

I think this is especially compelling given that SortedSet/SortedNumeric are our two only doc values types that use O(maxDoc) memory because of the offsets map. When this new strategy is used, memory usage could be bounded to a constant.



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