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https://issues.apache.org/jira/browse/LUCENE-7474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-7474:
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Attachment: LUCENE-7474.patch
Here is a patch. Writers now only store actual values (not placeholders for
documents that do not have a value) and documents that have a value for the
field are encoded using a FixedBitSet. While this is still technically linear,
this should be significantly faster in the sparse case since many documents can
be skipped at once.
> Improve doc values writers
> --------------------------
>
> Key: LUCENE-7474
> URL: https://issues.apache.org/jira/browse/LUCENE-7474
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Assignee: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7474.patch
>
>
> One of the goals of the new iterator-based API is to better handle sparse
> data. However, the current doc values writers still use a dense
> representation, and some of them perform naive linear scans in the nextDoc
> implementation.
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