Adrien Grand created LUCENE-6863:
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Summary: Store sparse doc values more efficiently
Key: LUCENE-6863
URL: https://issues.apache.org/jira/browse/LUCENE-6863
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
Assignee: Adrien Grand
For both NUMERIC fields and ordinals of SORTED fields, we store data in a dense
way. As a consequence, if you have only 1000 documents out of 1B that have a
value, and 8 bits are required to store those 1000 numbers, we will not require
1KB of storage, but 1GB.
I suspect this mostly happens in abuse cases, but still it's a pity that we
explode storage requirements. We could try to detect sparsity and compress
accordingly.
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