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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