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Posted to issues@lucene.apache.org by "Greg Miller (Jira)" <ji...@apache.org> on 2021/03/17 22:24:00 UTC
[jira] [Created] (LUCENE-9850) Explore PFOR for Doc ID delta
encoding (instead of FOR)
Greg Miller created LUCENE-9850:
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Summary: Explore PFOR for Doc ID delta encoding (instead of FOR)
Key: LUCENE-9850
URL: https://issues.apache.org/jira/browse/LUCENE-9850
Project: Lucene - Core
Issue Type: Task
Components: core/codecs
Affects Versions: main (9.0)
Reporter: Greg Miller
It'd be interesting to explore using PFOR instead of FOR for doc ID encoding. Right now PFOR is used for positions, frequencies and payloads, but FOR is used for doc ID deltas. From a recent [conversation|http://mail-archives.apache.org/mod_mbox/lucene-dev/202103.mbox/%3CCAPsWd%2BOp7d_GxNosB5r%3DQMPA-v0SteHWjXUmG3gwQot4gkubWw%40mail.gmail.com%3E] on the dev mailing list, it sounds like this decision was made based on the optimization possible when expanding the deltas.
I'd be interesting in measuring the index size reduction possible with switching to PFOR compared to the performance reduction we might see by no longer being able to apply the deltas in as optimal a way.
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