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https://issues.apache.org/jira/browse/LUCENE-7457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-7457:
---------------------------------
Attachment: LUCENE-7457.patch
Here is a patch implementing what Mike describes above as the bare minimum. I'm
not sure it is worth spending too much time on this since we will probably want
to build a new DV format that better takes advantage of the iterator-style API
until 7.0 is released?
> Default doc values format should optimize for iterator access
> -------------------------------------------------------------
>
> Key: LUCENE-7457
> URL: https://issues.apache.org/jira/browse/LUCENE-7457
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Adrien Grand
> Priority: Blocker
> Fix For: master (7.0)
>
> Attachments: LUCENE-7457.patch
>
>
> In LUCENE-7407 we switched doc values consumption from random access API to
> an iterator API, but nothing was done there to improve the codec. We should
> do that here.
> At a bare minimum we should fix the existing very-sparse case to be a true
> iterator, and not wrapped with the silly legacy wrappers.
> I think we should also increase the threshold (currently 1%?) when we switch
> from dense to sparse encoding. This should fix LUCENE-7253, making merging
> of sparse doc values efficient ("pay for what you use").
> I'm sure there are many other things to explore to let codecs "take
> advantage" of the fact that they no longer need to offer random access to doc
> values.
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