Robert Muir created LUCENE-7081:
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Summary: Docvalues terms dict should sometimes prefix-compress
fixed-length data.
Key: LUCENE-7081
URL: https://issues.apache.org/jira/browse/LUCENE-7081
Project: Lucene - Core
Issue Type: Improvement
Reporter: Robert Muir
For Sorted/SortedSet types, we encode ordinals and a term dictionary (similar
to old lucene 3 term dictionary).
Originally we had no prefix compression, so we "save space" in the fixed-width
case by avoiding addressing, we can just use multiplication:
https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/lucene54/Lucene54DocValuesConsumer.java#L423-L425
But it means no compression whatsoever of the actual bytes, even if values are
enormous, I don't think its necessarily a good tradeoff. The lack of prefix
compression can become much more magnified now that we have fixed width 128-bit
point types in the sandbox...
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